{"product_id":"mens-winter-thermal-underwear-set-compression-long-johns","title":"Men's Thermal Underwear Set – Compression Long Johns S–4XL","description":"\n\u003ch2\u003eMen's Winter Thermal Underwear Set – Compression Long Johns\u003c\/h2\u003e\n\u003cp\u003eStay warm and perform at your best with this men's thermal underwear set. Crafted from a high-stretch polyester-elastane blend, this two-piece compression suit is engineered to retain body heat while supporting an active lifestyle — perfect for gym sessions, outdoor runs, winter sports, or simply layering up on cold days.\u003c\/p\u003e\n\n\u003cp\u003eMade in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThermal Insulation:\u003c\/strong\u003e Knit construction traps warmth close to your body without adding bulk.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e4-Way Stretch Compression:\u003c\/strong\u003e Polyester-elastane fabric moves with you, delivering a snug, supportive fit during high-intensity activity.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLong-Sleeve Top + Full-Length Pants:\u003c\/strong\u003e Complete two-piece set covers you from wrist to ankle.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMoisture-Managing Fabric:\u003c\/strong\u003e Helps wick sweat away to keep you dry and comfortable during workouts.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlatlock Seams:\u003c\/strong\u003e Minimises irritation during extended wear.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Size Range:\u003c\/strong\u003e Available in S \/ M \/ L \/ XL \/ 2XL \/ 3XL \/ 4XL to suit a broad range of body types.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVersatile Use:\u003c\/strong\u003e Ideal as gym base layer, running tights, skiing undergarment, or everyday winter thermal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSize Guide (Asian Sizing — Please Note)\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e⚠ Asian sizing runs 1–2 sizes smaller than European sizing. Please select based on your height and weight below:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable style=\"width:100%; border-collapse:collapse; font-size:14px;\"\u003e\n  \u003cthead\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n      \u003cth style=\"padding:8px; border:1px solid #ddd;\"\u003eSize\u003c\/th\u003e\n      \u003cth style=\"padding:8px; border:1px solid #ddd;\"\u003eHeight (cm)\u003c\/th\u003e\n      \u003cth style=\"padding:8px; border:1px solid #ddd;\"\u003eWeight (kg)\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eS\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e165–175\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e55–65\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eM\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e165–185\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e55–75\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eL\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e165–190\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e65–80\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eXL\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e165–195\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e75–90\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e2XL\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e170–200\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e85–100\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e3XL\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e170–200\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e95–105\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e4XL\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eContact us\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eContact us\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eIf you are unsure of your size, please don't hesitate to contact us before ordering — we're happy to help you find the perfect fit.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Polyester Blends \/ Elastane\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeave:\u003c\/strong\u003e Knit\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSleeve Length:\u003c\/strong\u003e Long Sleeve\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSizes Available:\u003c\/strong\u003e S, M, L, XL, 2XL, 3XL, 4XL\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGender:\u003c\/strong\u003e Men\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eItem Type:\u003c\/strong\u003e Two-Piece Thermal Set (Top + Bottoms)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel Number:\u003c\/strong\u003e GZ125\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eYou May Also Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/womens-high-waist-elastic-skinny-jeans-slim-stretch-denim-pants\"\u003eWomen's High-Waist Elastic Skinny Jeans | Slim Stretch Denim\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/womens-high-waist-fleece-lined-slim-pencil-jeans\"\u003eWomen's High-Waist Fleece-Lined Slim Pencil Jeans\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/womens-oversized-turtleneck-knit-pullover-sweater-thick-cozy\"\u003eWomen's Oversized Turtleneck Knit Pullover Sweater – Thick \u0026amp; Cozy\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/health.gov\/moveyourway\" target=\"_blank\" rel=\"noopener\"\u003eHHS Move Your Way physical activity guidance\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Is this men's thermal underwear set true to size?\u003c\/h4\u003e\n\u003cp\u003eA: This set follows Asian sizing, which typically runs 1–2 sizes smaller than European or Western sizing. We strongly recommend checking the size guide above and selecting based on your height and weight rather than your usual clothing size. When in doubt, size up or contact us for personalised guidance.\u003c\/p\u003e\n\u003ch4\u003eQ: Can I wear this thermal compression set for both gym workouts and outdoor winter activities?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely! The polyester-elastane compression fabric makes it an excellent base layer for gym training, running, cycling, skiing, and other cold-weather activities. Its thermal knit construction retains body heat, while the stretch fabric supports unrestricted movement.\u003c\/p\u003e\n\u003ch4\u003eQ: How should I care for this thermal underwear set?\u003c\/h4\u003e\n\u003cp\u003eA: We recommend machine washing on a gentle cycle with cold water and avoiding tumble drying on high heat to preserve the elastane fibres and maintain the garment's stretch and shape. Lay flat or hang to dry where possible.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Is this men's thermal underwear set true to size?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This set follows Asian sizing, which typically runs 1–2 sizes smaller than European or Western sizing. We strongly recommend checking the size guide above and selecting based on your height and weight rather than your usual clothing size. When in doubt, size up or contact us for personalised guidance.\"}}, {\"@type\": \"Question\", \"name\": \"Can I wear this thermal compression set for both gym workouts and outdoor winter activities?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Absolutely! The polyester-elastane compression fabric makes it an excellent base layer for gym training, running, cycling, skiing, and other cold-weather activities. Its thermal knit construction retains body heat, while the stretch fabric supports unrestricted movement.\"}}, {\"@type\": \"Question\", \"name\": \"How should I care for this thermal underwear set?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"We recommend machine washing on a gentle cycle with cold water and avoiding tumble drying on high heat to preserve the elastane fibres and maintain the garment's stretch and shape. 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