{"product_id":"prosaunas-thermo-aspen-1x4-t-g-sts4-wood665-1","title":"ProSaunas THERMO-ASPEN 1X4 (15mm x 90mm) T\u0026G STS4 | Sauna Wood, Thermally-Modified, Tongue \u0026 Groove, STS4 Profile, Nickel-Gap, Wall Material","description":"\u003cstyle\u003e\n    :root {\n        --navy: #09195b;\n        --white: #ffffff;\n        --grey: rgba(97, 97, 97, 1);\n        --light-grey: #f5f5f5;\n        --border: #e0e0e0;\n        --accent: #c8a96e;\n    }\n\n    body {\n        font-family: 'DM Sans', sans-serif;\n    }\n\n    .prosaunas-logo {\n        \/* \/* font-family: 'Playfair Display', serif; *\/\n        *\/ color: var(--white);\n        font-size: 1.5rem;\n        font-weight: 700;\n        letter-spacing: 0.04em;\n        text-decoration: none;\n    }\n\n    .prosaunas-logo span {\n        color: var(--accent);\n    }\n\n    \/* nav a {\n    color: rgba(255, 255, 255, 0.75);\n    text-decoration: none;\n    font-size: 0.85rem;\n    font-weight: 500;\n    margin-left: 28px;\n    letter-spacing: 0.03em;\n    transition: color 0.2s;\n  }\n\n  nav a:hover {\n    color: var(--white);\n  } *\/\n\n    \/* ── BREADCRUMB ── *\/\n    .prosaunas-breadcrumb {\n        background: var(--light-grey);\n        padding: 12px 48px;\n        font-size: 0.8rem;\n        color: var(--grey);\n    }\n\n    .prosaunas-breadcrumb a {\n        color: var(--navy);\n        text-decoration: none;\n    }\n\n    .prosaunas-breadcrumb a:hover {\n        text-decoration: underline;\n    }\n\n    .prosaunas-breadcrumb span {\n        margin: 0 6px;\n    }\n\n    \/* ── HERO BANNER ── *\/\n    .prosaunas-hero-banner {\n        position: relative;\n        width: 100%;\n        height: 300px;\n        overflow: hidden;\n        border-radius: 20px;\n    }\n\n    .prosaunas-hero-banner img {\n        width: 100%;\n        height: 100%;\n        object-fit: cover;\n        object-position: center;\n        display: block;\n    }\n\n    .prosaunas-hero-overlay {\n        position: absolute;\n        inset: 0;\n        background: linear-gradient(to right, rgba(9, 25, 91, 0.85) 42%, rgba(9, 25, 91, 0.15) 100%);\n        display: flex;\n        align-items: center;\n        padding: 0 72px;\n    }\n\n    .prosaunas-hero-text {\n        max-width: 520px;\n    }\n\n    .prosaunas-badge {\n        display: inline-block;\n        background: var(--accent);\n        color: var(--navy);\n        font-size: 1.3rem;\n        font-weight: 700;\n        letter-spacing: 0.12em;\n        text-transform: uppercase;\n        padding: 5px 12px;\n        border-radius: 2px;\n        margin-bottom: 16px;\n    }\n\n    .prosaunas-hero-text h1 {\n        \/* font-family: 'Playfair Display', serif; *\/\n        font-size: 3.5rem;\n        \/* font-size: 2.6rem; *\/\n        font-weight: 700;\n        color: var(--white);\n        line-height: 1.15;\n        margin-bottom: 10px;\n    }\n\n    .prosaunas-hero-text .prosaunas-subtitle {\n        color: rgba(255, 255, 255, 0.75);\n        font-size: 1.5rem;\n        margin-bottom: 6px;\n    }\n\n    .prosaunas-hero-text .prosaunas-sku {\n        color: rgba(255, 255, 255, 0.5);\n        font-size: 1.5rem;\n    }\n\n    \/* ── MAIN CONTENT ── *\/\n    .prosaunas-content-wrap {\n        max-width: 1100px;\n        margin: 0 auto;\n        padding: 60px 0px;\n    }\n\n    \/* ── COMPONENT BANNER ── *\/\n    .prosaunas-component-banner {\n        background: #eef1f9;\n        border-left: 4px solid var(--navy);\n        padding: 16px 20px;\n        border-radius: 20px;\n        margin-bottom: 56px;\n    }\n\n    .prosaunas-component-banner p {\n        font-size: 1.5rem;\n        color: var(--navy);\n        font-weight: 500;\n        line-height: 1.6;\n    }\n\n    .prosaunas-component-banner strong {\n        font-weight: 700;\n    }\n\n    \/* ── INTRO: image left, text right ── *\/\n    .prosaunas-intro-block {\n        display: grid;\n        grid-template-columns: 1fr 1fr;\n        gap: 52px;\n        align-items: center;\n        margin-bottom: 20px;\n    }\n\n    .prosaunas-intro-block img {\n        width: 100%;\n        border-radius: 20px;\n        display: block;\n        aspect-ratio: 4\/3;\n        object-fit: cover;\n    }\n\n    .prosaunas-intro-text h2 {\n        \/* font-family: 'Playfair Display', serif; *\/\n        font-size: 3rem;\n        color: var(--navy);\n        margin-bottom: 16px;\n    }\n\n    .prosaunas-intro-text p {\n        font-size: 1.5rem;\n        color: #444;\n        line-height: 1.8;\n        margin-bottom: 14px;\n    }\n\n    \/* Spec chips *\/\n    .prosaunas-spec-chips {\n        display: flex;\n        flex-wrap: wrap;\n        gap: 8px;\n        margin-top: 20px;\n        margin-bottom: 50px;\n    }\n\n    .prosaunas-chip {\n        background: var(--light-grey);\n        border: 1px solid var(--border);\n        border-radius: 20px;\n        padding: 6px 14px;\n        font-size: 1.5rem;\n        color: #333;\n    }\n\n    .prosaunas-chip strong {\n        color: var(--navy);\n        font-weight: 600;\n    }\n\n    \/* ── SECTION TITLE ── *\/\n    .prosaunas-section-title {\n        \/* font-family: 'Playfair Display', serif; *\/\n        font-size: 3.5rem;\n        color: var(--navy);\n        margin-bottom: 28px;\n        padding-bottom: 10px;\n        border-bottom: 2px solid var(--border);\n    }\n\n    \/* ── FEATURES: table + side images ── *\/\n    .prosaunas-features-block {\n        display: grid;\n        grid-template-columns: 1fr 340px;\n        gap: 48px;\n        align-items: start;\n        margin-bottom: 72px;\n    }\n\n    .prosaunas-features-table {\n        width: 100%;\n        border-collapse: collapse;\n        font-size: 0.88rem;\n    }\n\n    .prosaunas-features-table thead tr {\n        background: var(--navy);\n        color: var(--white);\n    }\n\n    .prosaunas-features-table thead th {\n        padding: 13px 18px;\n        text-align: left;\n        font-weight: 600;\n        letter-spacing: 0.06em;\n        font-size: 1.5rem;\n        text-transform: uppercase;\n    }\n\n    .prosaunas-features-table thead th:first-child {\n        width: 36%;\n    }\n\n    .prosaunas-features-table tbody tr {\n        border-bottom: 1px solid var(--border);\n        font-size: 1.5rem;\n    }\n\n    .prosaunas-features-table tbody tr:nth-child(even) {\n        background: var(--light-grey);\n    }\n\n    .prosaunas-features-table tbody td {\n        padding: 13px 18px;\n        vertical-align: top;\n        line-height: 1.6;\n    }\n\n    .prosaunas-features-table tbody td:first-child {\n        font-weight: 600;\n        color: var(--navy);\n    }\n\n    .prosaunas-benefit-icon {\n        color: var(--accent);\n        margin-right: 4px;\n    }\n\n    .prosaunas-features-side {\n        display: flex;\n        flex-direction: column;\n        gap: 14px;\n        position: sticky;\n        top: 24px;\n    }\n\n    .prosaunas-features-side img {\n        width: 100%;\n        border-radius: 4px;\n        display: block;\n        object-fit: cover;\n    }\n\n    .prosaunas-features-side img:first-child {\n        aspect-ratio: 3\/2;\n    }\n\n    .prosaunas-features-side img:last-child {\n        aspect-ratio: 4\/3;\n    }\n\n    \/* ── WHY HEMLOCK ── *\/\n    .prosaunas-why-section {\n        background: var(--navy);\n        padding: 60px 48px;\n        margin-bottom: 72px;\n        border-radius: 20px;\n    }\n\n    .prosaunas-why-section h2 {\n        \/* font-family: 'Playfair Display', serif; *\/\n        color: var(--white);\n        font-size: 3rem;\n        margin-bottom: 8px;\n        text-align: center;\n    }\n\n    .prosaunas-why-section .prosaunas-sub {\n        color: rgba(255, 255, 255, 0.6);\n        font-size: 1.5rem;\n        text-align: center;\n        margin-bottom: 40px;\n    }\n\n    .prosaunas-why-cards {\n        display: grid;\n        grid-template-columns: repeat(3, 1fr);\n        gap: 22px;\n    }\n\n    .prosaunas-why-card {\n        background: rgba(255, 255, 255, 0.07);\n        border: 1px solid rgba(255, 255, 255, 0.13);\n        border-radius: 20px;\n        padding: 28px 22px;\n    }\n\n    .prosaunas-why-card .prosaunas-icon {\n        font-size: 3rem;\n        margin-bottom: 12px;\n    }\n\n    .prosaunas-why-card h3 {\n        \/* font-family: 'Playfair Display', serif; *\/\n        color: var(--white);\n        font-size: 2.5rem;\n        margin-bottom: 10px;\n    }\n\n    .prosaunas-why-card p {\n        color: rgba(255, 255, 255, 0.68);\n        font-size: 1.5rem;\n        line-height: 1.65;\n    }\n\n    \/* ── SPECS + IMAGE ── *\/\n    .prosaunas-specs-block {\n        display: grid;\n        grid-template-columns: 1fr 1fr;\n        gap: 48px;\n        align-items: start;\n        margin-bottom: 72px;\n    }\n\n    .prosaunas-specs-grid {\n        display: grid;\n        grid-template-columns: 1fr 1fr;\n        gap: 1px;\n        background: var(--border);\n        border: 1px solid var(--border);\n        border-radius: 4px;\n        overflow: hidden;\n    }\n\n    .prosaunas-spec-row {\n        background: var(--white);\n        padding: 13px 16px;\n        display: flex;\n        flex-direction: column;\n        gap: 3px;\n    }\n\n    .prosaunas-spec-row:nth-child(even) {\n        background: var(--light-grey);\n    }\n\n    .prosaunas-spec-label {\n        font-size: 1.5rem;\n        font-weight: 700;\n        text-transform: uppercase;\n        letter-spacing: 0.08em;\n        color: var(--grey);\n    }\n\n    .prosaunas-spec-value {\n        font-size: 1.5rem;\n        font-weight: 600;\n        color: var(--navy);\n    }\n\n    .prosaunas-nominal-note {\n        margin-top: 20px;\n        padding: 14px 18px;\n        background: #fffbf2;\n        border: 1px solid #e8d9b0;\n        border-radius: 10px;\n        font-size: 1.5rem;\n        color: #6b5523;\n        line-height: 1.6;\n    }\n\n    .prosaunas-nominal-note strong {\n        font-weight: 700;\n    }\n\n    .prosaunas-specs-side img {\n        width: 100%;\n        border-radius: 4px;\n        display: block;\n        aspect-ratio: 3\/4;\n        object-fit: cover;\n    }\n\n    .prosaunas-specs-side figcaption {\n        font-size: 0.78rem;\n        color: var(--grey);\n        margin-top: 8px;\n        text-align: center;\n    }\n\n    \/* ── SHIPPING ── *\/\n    .prosaunas-shipping-block {\n        background: var(--light-grey);\n        border-radius: 20px;\n        padding: 36px 40px;\n        margin-bottom: 72px;\n        display: grid;\n        grid-template-columns: 1fr 1fr;\n        gap: 40px;\n        align-items: start;\n    }\n\n    .prosaunas-shipping-block h2 {\n        \/* font-family: 'Playfair Display', serif; *\/\n        color: var(--navy);\n        font-size: 3rem;\n        margin-bottom: 14px;\n    }\n\n    .prosaunas-shipping-block p {\n        font-size: 1.5rem;\n        color: #444;\n        line-height: 1.75;\n        margin-bottom: 14px;\n    }\n\n    .prosaunas-shipping-block ul {\n        padding-left: 18px;\n    }\n\n    .prosaunas-shipping-block li {\n        font-size: 1.5rem;\n        color: var(--grey);\n        line-height: 2.1;\n    }\n\n    .prosaunas-shipping-contact {\n        background: var(--navy);\n        border-radius: 20px;\n        padding: 28px 24px;\n    }\n\n    .prosaunas-shipping-contact h3 {\n        \/* font-family: 'Playfair Display', serif; *\/\n        font-size: 2.5rem;\n        margin-bottom: 14px;\n        color: var(--white);\n    }\n\n    .prosaunas-shipping-contact p {\n        font-size: 1.5rem;\n        color: rgba(255, 255, 255, 0.75);\n        line-height: 1.7;\n        margin-bottom: 10px;\n    }\n\n    .prosaunas-shipping-contact a {\n        color: #fff;\n        text-decoration: none;\n        font-weight: 600;\n    }\n\n    \/* ── QUALITY ── *\/\n    .prosaunas-quality-section {\n        text-align: center;\n        margin-bottom: 60px;\n    }\n\n    .prosaunas-quality-section h2 {\n        \/* font-family: 'Playfair Display', serif; *\/\n        color: var(--navy);\n        font-size: 3rem;\n        margin-bottom: 14px;\n    }\n\n    .prosaunas-quality-section p {\n        color: var(--grey);\n        font-size: 1.5rem;\n        max-width: 680px;\n        margin: 0 auto 36px;\n        line-height: 1.75;\n    }\n\n    .prosaunas-quality-stats {\n        display: flex;\n        justify-content: center;\n        gap: 64px;\n    }\n\n    .prosaunas-stat-number {\n        \/* font-family: 'Playfair Display', serif; *\/\n        font-size: 3rem;\n        font-weight: 700;\n        color: var(--navy);\n        line-height: 1;\n    }\n\n    .prosaunas-stat-label {\n        font-size: 1.5rem;\n        color: var(--grey);\n        text-transform: uppercase;\n        letter-spacing: 0.06em;\n        margin-top: 5px;\n    }\n\n    \/* ── WHAT'S INCLUDED ── *\/\n    .prosaunas-included-block {\n        display: grid;\n        grid-template-columns: 340px 1fr;\n        gap: 48px;\n        align-items: center;\n        margin-bottom: 72px;\n    }\n\n    .prosaunas-included-image img {\n        width: 100%;\n        border-radius: 4px;\n        display: block;\n        aspect-ratio: 4\/3;\n        object-fit: cover;\n    }\n\n    .prosaunas-included-list {\n        list-style: none;\n        padding: 0;\n        margin: 0;\n        display: flex;\n        flex-direction: column;\n        gap: 12px;\n    }\n\n    .prosaunas-included-item {\n        display: flex;\n        align-items: center;\n        gap: 14px;\n        padding: 16px 20px;\n        background: var(--light-grey);\n        border: 1px solid var(--border);\n        border-left: 4px solid var(--navy);\n        border-radius: 20px;\n    }\n\n    .prosaunas-included-icon {\n        display: flex;\n        align-items: center;\n        justify-content: center;\n        width: 28px;\n        height: 28px;\n        min-width: 28px;\n        background: var(--navy);\n        color: var(--white);\n        font-size: 1.6rem;\n        font-weight: 700;\n        border-radius: 50%;\n    }\n\n    .prosaunas-included-text {\n        font-size: 1.4rem;\n        font-weight: 500;\n        color: #1a1a1a;\n    }\n\n    @media (max-width: 860px) {\n        .prosaunas-included-block {\n            grid-template-columns: 1fr;\n        }\n    }\n\n    \/* ── RESPONSIVE ── *\/\n    @media (max-width: 860px) {\n\n        .prosaunas-breadcrumb {\n            padding: 10px 20px;\n        }\n\n        .prosaunas-hero-banner {\n            height: 300px;\n        }\n\n        .prosaunas-hero-overlay {\n            padding: 0 24px;\n        }\n\n        .prosaunas-hero-text h1 {\n            font-size: 1.8rem;\n        }\n\n        .prosaunas-content-wrap {\n            padding: 32px 20px;\n        }\n\n        .prosaunas-intro-block,\n        .prosaunas-features-block,\n        .prosaunas-specs-block,\n        .prosaunas-shipping-block {\n            grid-template-columns: 1fr;\n        }\n\n        .prosaunas-features-side {\n            flex-direction: row;\n            position: static;\n        }\n\n        .prosaunas-features-side img {\n            flex: 1;\n            aspect-ratio: 1 !important;\n            width: 50px;\n        }\n\n        .prosaunas-why-cards {\n            grid-template-columns: 1fr;\n        }\n\n        .prosaunas-quality-stats {\n            gap: 28px;\n        }\n\n        .prosaunas-specs-grid {\n            grid-template-columns: 1fr;\n        }\n    }\n\u003c\/style\u003e\n\u003c!-- HERO — full-width image with title overlaid --\u003e\n\u003cdiv class=\"prosaunas-hero-banner\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0585\/1224\/4854\/files\/PROSAUNAS-Thermo-Aspen-Interior-1_445e9bd4-3143-46a7-a9d5-75890d2e1f91.jpg?v=1775218219\" alt=\"PROSAUNAS Wood\"\u003e\n\u003cdiv class=\"prosaunas-hero-overlay\"\u003e\n\u003cdiv class=\"prosaunas-hero-text\"\u003e\n\u003cdiv class=\"prosaunas-badge\"\u003eSauna Wood · Bench \u0026amp; Floor Material\u003c\/div\u003e\n\u003ch1\u003eProSaunas THERMO-ASPEN 1X4 (15mm x 90mm) T\u0026amp;G STS4\u003c\/h1\u003e\n\u003cp class=\"prosaunas-subtitle\"\u003eSauna Wood, Thermally-Modified, Tongue \u0026amp; Groove\u003c\/p\u003e\n\u003cp class=\"prosaunas-sku\"\u003eSKU: WOOD665-1  ·  Model: THERMO-ASPEN 1X4 T\u0026amp;G STS4\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"prosaunas-content-wrap\"\u003e\n\u003c!-- WHAT IS THIS PRODUCT --\u003e\n\u003cdiv class=\"prosaunas-component-banner\"\u003e\n  \u003cp\u003e🪵 \u003cstrong\u003eWhat is this material used for?\u003c\/strong\u003e This is a tongue and groove sauna wall panel, designed for lining interior surfaces and creating a consistent wall finish. It forms tight interlocking joints, delivers clean spacing with a subtle gap detail, and enhances the overall look of the sauna interior.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- INTRO: sauna interior photo + description text side by side --\u003e\n\u003cdiv class=\"prosaunas-intro-block\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0585\/1224\/4854\/files\/thermo-aspen-1x4-tg-sts4-sauna-wood-prosaunas_2.jpg?v=1775215871\" alt=\"Premium sauna interior showing bench construction with natural wood\"\u003e\n\u003cdiv class=\"prosaunas-intro-text\"\u003e\n\u003ch2\u003eClean Lines. Seamless Walls.\u003c\/h2\u003e\n\u003cp\u003ePROSAUNAS Thermo-Aspen 1×4 T\u0026amp;G STS4 is a premium sauna wall panel designed for consistent wall cladding and refined interior finishes. Featuring a tongue and groove system with a subtle nickel-gap detail, it creates clean, uniform lines while enhancing the overall visual depth of the sauna space.\u003c\/p\u003e\n\u003cp\u003eThermally modified Aspen offers superior durability and dimensional stability, making it ideal for sauna environments. The heat treatment process reduces moisture movement and enriches the wood’s natural tone, ensuring reliable performance under high temperatures and humidity.\u003c\/p\u003e\n\u003cp\u003eEach board is precision-milled for accurate fit and straightforward installation. The STS4 profile ensures smooth surfaces and defined spacing, delivering a balanced combination of modern detail and practical performance.\u003c\/p\u003e\n\u003cp\u003ePROSAUNAS carefully selects high-quality Aspen to achieve consistent colour, fine grain, and long-lasting durability. This makes it a dependable choice for both residential and commercial sauna wall applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"prosaunas-spec-chips\"\u003e\n\u003cdiv class=\"prosaunas-chip\"\u003e\n\u003cstrong\u003eSpecies:\u003c\/strong\u003e Thermo-Aspen\u003c\/div\u003e\n\u003cdiv class=\"prosaunas-chip\"\u003e\n\u003cstrong\u003eProfile:\u003c\/strong\u003e STS4 T\u0026amp;G (Nickel-Gap)\u003c\/div\u003e\n\u003cdiv class=\"prosaunas-chip\"\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Wall Cladding\u003c\/div\u003e\n\u003cdiv class=\"prosaunas-chip\"\u003e\n\u003cstrong\u003eGrain:\u003c\/strong\u003e Fine, Straight Grain\u003c\/div\u003e\n\u003cdiv class=\"prosaunas-chip\"\u003e\n\u003cstrong\u003eSurface:\u003c\/strong\u003e Smooth Planed\u003c\/div\u003e\n\u003cdiv class=\"prosaunas-chip\"\u003e\n\u003cstrong\u003eNominal Size:\u003c\/strong\u003e 1X4 (15mm x 90mm)\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- FEATURES \u0026 BENEFITS — table with wood detail images alongside --\u003e\n\u003ch2 class=\"prosaunas-section-title\"\u003eFeatures \u0026amp; Benefits\u003c\/h2\u003e\n\u003cdiv class=\"prosaunas-features-block\"\u003e\n\u003ctable class=\"prosaunas-features-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eBenefit - Why It Matters to Your Build\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eThermo-Aspen Wall Boards\u003c\/td\u003e\n\u003ctd\u003e\n\u003cspan class=\"prosaunas-benefit-icon\"\u003e✦\u003c\/span\u003eHeat-treated sauna wood – improves stability, deepens colour, and limits moisture movement.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eT\u0026amp;G STS4 Profile\u003c\/td\u003e\n\u003ctd\u003e\n\u003cspan class=\"prosaunas-benefit-icon\"\u003e✦\u003c\/span\u003eTongue and groove design with nickel-gap – creates clean lines and defined spacing.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWall Cladding Use\u003c\/td\u003e\n\u003ctd\u003e\n\u003cspan class=\"prosaunas-benefit-icon\"\u003e✦\u003c\/span\u003eDesigned for full wall coverage – delivers a uniform and structured interior finish.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterlocking Board System\u003c\/td\u003e\n\u003ctd\u003e\n\u003cspan class=\"prosaunas-benefit-icon\"\u003e✦\u003c\/span\u003eBoards fit tightly together – ensures secure alignment and minimal gaps.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePerforms in Sauna Heat\u003c\/td\u003e\n\u003ctd\u003e\n\u003cspan class=\"prosaunas-benefit-icon\"\u003e✦\u003c\/span\u003eHandles high temperature and humidity – maintains shape over time.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSmooth Planed Finish\u003c\/td\u003e\n\u003ctd\u003e\n\u003cspan class=\"prosaunas-benefit-icon\"\u003e✦\u003c\/span\u003eCarefully machined surface – enhances comfort and visual quality.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConsistent Tone \u0026amp; Grain\u003c\/td\u003e\n\u003ctd\u003e\n\u003cspan class=\"prosaunas-benefit-icon\"\u003e✦\u003c\/span\u003eEven thermo-treated appearance – provides a cohesive interior look.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStable \u0026amp; Durable Wood\u003c\/td\u003e\n\u003ctd\u003e\n\u003cspan class=\"prosaunas-benefit-icon\"\u003e✦\u003c\/span\u003eReduces warping and expansion – supports long-term performance.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuick Installation Boards\u003c\/td\u003e\n\u003ctd\u003e\n\u003cspan class=\"prosaunas-benefit-icon\"\u003e✦\u003c\/span\u003ePrecision-milled sizing – allows efficient and accurate fitting.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnhances Sauna Interiors\u003c\/td\u003e\n\u003ctd\u003e\n\u003cspan class=\"prosaunas-benefit-icon\"\u003e✦\u003c\/span\u003eAdds depth and clean detailing – elevates overall design appeal.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c!-- Wood detail images beside the table --\u003e\n\u003cdiv class=\"prosaunas-features-side\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0585\/1224\/4854\/files\/thermo-aspen-1x4-tg-sts4-sauna-wood-prosaunas_1.jpg?v=1775215871\" alt=\"Close-up Wood\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0585\/1224\/4854\/files\/thermo-aspen-1x4-tg-sts4-sauna-wood-prosaunas_3.jpg?v=1775215871\" alt=\"Close-up Wood\"\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- WHY CEDAR cards --\u003e\n\u003cdiv class=\"prosaunas-why-section\"\u003e\n\u003ch2\u003eWhy Choose Thermo-Aspen Wall Panels for Your Sauna Interior?\u003c\/h2\u003e\n\u003cp class=\"prosaunas-sub\"\u003eThree reasons installers prefer this profile for smooth wall cladding and consistent finishes.\u003c\/p\u003e\n\u003cdiv class=\"prosaunas-why-cards\"\u003e\n\u003cdiv class=\"prosaunas-why-card\"\u003e\n\u003cdiv class=\"prosaunas-icon\"\u003e🌡️\u003c\/div\u003e\n\u003ch3\u003eBuilt for Sauna Heat\u003c\/h3\u003e\n\u003cp\u003eThermally modified Aspen is designed for high temperatures. Its improved stability reduces expansion and contraction, helping panels stay aligned and secure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"prosaunas-why-card\"\u003e\n\u003cdiv class=\"prosaunas-icon\"\u003e💧\u003c\/div\u003e\n\u003ch3\u003eManages Moisture Well\u003c\/h3\u003e\n\u003cp\u003eThe heat-treatment process enhances resistance to humidity. This helps minimise warping and movement, ensuring long-lasting wall performance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"prosaunas-why-card\"\u003e\n\u003cdiv class=\"prosaunas-icon\"\u003e🎨\u003c\/div\u003e\n\u003ch3\u003eClean and Uniform Lines\u003c\/h3\u003e\n\u003cp\u003eThe STS4 tongue and groove profile with nickel-gap creates defined spacing. Its smooth surface and warm tone deliver a modern, polished sauna interior.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- SPECIFICATIONS with profile image alongside --\u003e\n\u003ch2 class=\"prosaunas-section-title\"\u003eSpecifications\u003c\/h2\u003e\n\u003cdiv class=\"prosaunas-specs-block\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"prosaunas-specs-grid\"\u003e\n\u003cdiv class=\"prosaunas-spec-row\"\u003e\n\u003cspan class=\"prosaunas-spec-label\"\u003eSpecies\u003c\/span\u003e \u003cspan class=\"prosaunas-spec-value\"\u003eThermo-Aspen\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"prosaunas-spec-row\"\u003e\n\u003cspan class=\"prosaunas-spec-label\"\u003eNominal Size\u003c\/span\u003e \u003cspan class=\"prosaunas-spec-value\"\u003e1X4\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"prosaunas-spec-row\"\u003e\n  \u003cspan class=\"prosaunas-spec-label\"\u003eProfile\u003c\/span\u003e \u003cspan class=\"prosaunas-spec-value\"\u003eSTS4 T\u0026amp;G (Nickel-Gap)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"prosaunas-spec-row\"\u003e\n\u003cspan class=\"prosaunas-spec-label\"\u003eGrain Type\u003c\/span\u003e \u003cspan class=\"prosaunas-spec-value\"\u003eFine, Straight Grain\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"prosaunas-spec-row\"\u003e\n\u003cspan class=\"prosaunas-spec-label\"\u003eFinish\u003c\/span\u003e \u003cspan class=\"prosaunas-spec-value\"\u003eThermally Modified\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"prosaunas-spec-row\"\u003e\n\u003cspan class=\"prosaunas-spec-label\"\u003eApplication\u003c\/span\u003e \u003cspan class=\"prosaunas-spec-value\"\u003eWall Cladding\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"prosaunas-spec-row\"\u003e\n\u003cspan class=\"prosaunas-spec-label\"\u003eWall Coverage\u003c\/span\u003e \u003cspan class=\"prosaunas-spec-value\"\u003e3.1\" (80mm)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"prosaunas-spec-row\"\u003e\n\u003cspan class=\"prosaunas-spec-label\"\u003eProduct Width\u003c\/span\u003e \u003cspan class=\"prosaunas-spec-value\"\u003e3.54\" (90mm)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"prosaunas-spec-row\"\u003e\n\u003cspan class=\"prosaunas-spec-label\"\u003eProduct Thickness\u003c\/span\u003e \u003cspan class=\"prosaunas-spec-value\"\u003e0.59\" (15mm)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"prosaunas-spec-row\"\u003e\n\u003cspan class=\"prosaunas-spec-label\"\u003eLength Availability\u003c\/span\u003e \u003cspan class=\"prosaunas-spec-value\"\u003eUp to 10'\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"prosaunas-spec-row\"\u003e\n\u003cspan class=\"prosaunas-spec-label\"\u003eColor\u003c\/span\u003e \u003cspan class=\"prosaunas-spec-value\"\u003eWarm Natural Brown Tone\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"prosaunas-spec-row\"\u003e\n\u003cspan class=\"prosaunas-spec-label\"\u003eSKU\u003c\/span\u003e \u003cspan class=\"prosaunas-spec-value\"\u003eWOOD665-1\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"prosaunas-nominal-note\"\u003e\n\u003cstrong\u003e⚠ Nominal vs. Actual Lumber Sizes:\u003c\/strong\u003e In North America, wood sizes are listed in \u003cem\u003enominal\u003c\/em\u003e measurements, which is the lumber’s size when it is cut from moist logs. After shrinkage from drying and surfacing, the actual size of lumber will be less than its nominal size. Please see the diagram for actual dimensions.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cfigure class=\"prosaunas-specs-side\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0585\/1224\/4854\/files\/thermo-aspen-1x4-tg-sts4-sauna-wood-prosaunas_5_0.jpg?v=1775215871\" alt=\"Sauna wall panel profile showing tongue and groove V-joint edges\"\u003e\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003c!-- WHAT'S INCLUDED --\u003e\n\u003ch2 class=\"prosaunas-section-title\"\u003eWhat's Included\u003c\/h2\u003e\n\u003cdiv class=\"prosaunas-included-block\"\u003e\n\u003cfigure class=\"prosaunas-included-image\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0585\/1224\/4854\/files\/thermo-aspen-1x4-tg-sts4-sauna-wood-prosaunas_7_0.jpg?v=1775215871\" alt=\"Sauna wall panel profile view showing tongue and groove V-joint edges\"\u003e\u003c\/figure\u003e\n\u003cul class=\"prosaunas-included-list\"\u003e\n\u003cli class=\"prosaunas-included-item\"\u003e\n\u003cspan class=\"prosaunas-included-icon\"\u003e✓\u003c\/span\u003e \u003cspan class=\"prosaunas-included-text\"\u003eThermo-Aspen 1×4 Wall Panel\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"prosaunas-included-item\"\u003e\n\u003cspan class=\"prosaunas-included-icon\"\u003e✓\u003c\/span\u003e \u003cspan class=\"prosaunas-included-text\"\u003eSTS4 T\u0026amp;G Nickel-Gap Profile\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- SHIPPING --\u003e\n\u003cdiv class=\"prosaunas-shipping-block\"\u003e\n\u003cdiv\u003e\n\u003ch2\u003eShipping Information\u003c\/h2\u003e\n\u003cp\u003eWood products ship via standard freight. Shipping cost is calculated based on order quantity, board lengths, and your delivery location — it is not included in the listed price and will be quoted separately.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eStandard freight shipping on all wood orders\u003c\/li\u003e\n\u003cli\u003eShipping cost varies by order size and destination\u003c\/li\u003e\n\u003cli\u003eContact PROSAUNAS for a freight quote before ordering\u003c\/li\u003e\n\u003cli\u003eBulk orders may qualify for volume pricing\u003c\/li\u003e\n\u003cli\u003eAll orders inspected before shipment for quality assurance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"prosaunas-shipping-contact\"\u003e\n\u003ch3\u003e📞 Have Questions?\u003c\/h3\u003e\n\u003cp\u003eOur team has 55+ years of experience helping builders select the right wood. We're happy to help you calculate quantities, confirm sizing, or get a shipping quote.\u003c\/p\u003e\n\u003cp\u003eCall: \u003ca href=\"tel:8009572862\" style=\"color: #fff;\"\u003e(800) 957-2862\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eEmail: \u003ca href=\"mailto:info@peakprimalwellness.com\" style=\"color: #fff;\"\u003einfo@peakprimalwellness.com\u003c\/a\u003e\u003c\/p\u003e\n\u003cp style=\"margin-top: 10px; font-size: 0.78rem; color: rgba(255,255,255,0.45);\"\u003eMon–Fri 8:00am–5:00pm CT\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- QUALITY PROMISE --\u003e\n\u003cdiv class=\"prosaunas-quality-section\"\u003e\n\u003ch2\u003eThe PROSAUNAS Quality Promise\u003c\/h2\u003e\n\u003cp\u003ePROSAUNAS carefully selects only the finest wood from Northern Europe and Canada, ensuring quality and consistency that meets our stringent standards. Every board is inspected before it ships — because a great sauna starts with great materials.\u003c\/p\u003e\n\u003cdiv class=\"prosaunas-quality-stats\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"prosaunas-stat-number\"\u003e55+\u003c\/div\u003e\n\u003cdiv class=\"prosaunas-stat-label\"\u003eYears of Experience\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"prosaunas-stat-number\"\u003e100%\u003c\/div\u003e\n\u003cdiv class=\"prosaunas-stat-label\"\u003eQuality Inspected\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"prosaunas-stat-number\"\u003eNorth America\u003c\/div\u003e\n\u003cdiv class=\"prosaunas-stat-label\"\u003eServing Builders Across\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- \/content-wrap --\u003e","brand":"ProSaunas","offers":[{"title":"1' (11-1\/2\")","offer_id":43253220868214,"sku":"WOOD665-1","price":4.38,"currency_code":"USD","in_stock":true},{"title":"2' (23-1\/2\")","offer_id":43253221032054,"sku":"WOOD665-2","price":8.76,"currency_code":"USD","in_stock":false},{"title":"3' (35-1\/2\")","offer_id":43253221097590,"sku":"WOOD665-3","price":13.13,"currency_code":"USD","in_stock":false},{"title":"4' (47-1\/2\")","offer_id":43253221195894,"sku":"WOOD665-4","price":17.51,"currency_code":"USD","in_stock":false},{"title":"5' (59-1\/8\")","offer_id":43253221359734,"sku":"WOOD665-5","price":21.89,"currency_code":"USD","in_stock":false},{"title":"6' (71-1\/4\")","offer_id":43253221523574,"sku":"WOOD665-6","price":26.27,"currency_code":"USD","in_stock":false},{"title":"7' (82-7\/8\")","offer_id":43253221621878,"sku":"WOOD665-7","price":30.64,"currency_code":"USD","in_stock":false},{"title":"8' (94-3\/4\")","offer_id":43253221687414,"sku":"WOOD665-8","price":35.02,"currency_code":"USD","in_stock":false},{"title":"9' (106-1\/2\")","offer_id":43253221851254,"sku":"WOOD665-9","price":39.4,"currency_code":"USD","in_stock":false},{"title":"10' (118-1\/4\")","offer_id":43253221949558,"sku":"WOOD665-10","price":43.78,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0585\/1224\/4854\/files\/thermo-aspen-1x4-tg-sts4-sauna-wood-prosaunas_1.jpg?v=1778622372","url":"https:\/\/peakprimalwellness.com\/products\/prosaunas-thermo-aspen-1x4-t-g-sts4-wood665-1","provider":"Peak Primal Wellness","version":"1.0","type":"link"}