{"title":"Thermal Base Layers","description":"\u003cp\u003eShop thermal base layers designed for skiing, cold weather, outdoor training, running, and everyday layering. Explore lightweight base layer sets with soft stretch fabrics, moisture-wicking comfort, and easy movement for active days in low temperatures.\u003c\/p\u003e","products":[{"product_id":"iuk-two-piece-7-merino-wool-blend-base-layer-set-thermal-underwear-skiing-cold-weather-quick-dry-moisture-wicking-breathable","title":"IUK Two Piece 7% Merino Wool Blend Base Layer Set Thermal Underwear Skiing Cold Weather Quick-Dry Moisture Wicking Breathable","description":"\u003cul\u003e\n\u003cli\u003eSIZE GUIDE – ORDER BY SIZE CHART, NOT YOUR USUAL SIZE: The size tag sewn on the clothing follows Asian sizing and will SHOW ABOUT 2 SIZES LARGER than your ordered size (THIS IS NORMAL). Please choose your size based on the size chart measurements. This slim-fit women’s base layer set is designed for a close athletic fit for skiing, hiking, running, and winter sports.\u003c\/li\u003e\n\u003cli\u003eWOOL BLEND PERFORMANCE FABRIC – 7% WOOL: This is a performance wool blend base layer containing 7% WOOL, not 100% wool. The fabric combines wool with polyester, nylon, lyocell, and spandex to provide better stretch, shape retention, and durability than 100% wool thermal underwear. Unlike pure wool base layer sets that may stretch out and lose elasticity after workouts and washing, this women's merino wool base layer maintains its shape and flexibility for long-term use.\u003c\/li\u003e\n\u003cli\u003eACTIVE THERMAL BASE LAYER – DESIGNED FOR MOVEMENT: Best for skiing, hiking, running and active use. Not designed as a heavyweight thermal for sitting still in extreme cold. This women’s thermal underwear provides warmth while remaining lightweight and breathable. Ventilation mesh at the chest, underarms, and back helps regulate temperature during activity.\u003c\/li\u003e\n\u003cli\u003eADVANCED MOISTURE-WICKING \u0026amp; SEAMLESS COMFORT: Stay dry and comfortable with moisture-wicking one-way transport technology that pulls sweat away from your skin. Armpit 3D ventilation and honeycomb mesh panels accelerate evaporation to reduce post-workout chills. Seamless knitting minimizes friction and irritation, while targeted compression at knees and elbows provides support during skiing, hiking, and training.\u003c\/li\u003e\n\u003cli\u003eDURABLE \u0026amp; EASY CARE PERFORMANCE THERMAL SET: Built for long-lasting performance, this women’s thermal underwear set is machine washable and retains its shape after repeated washes. Natural wool fibers help reduce odor, while the stretch fabric keeps a secure fit even after intense activity. Ideal for skiing, snowboarding, running, gym workouts, and outdoor winter adventures.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"IUK","offers":[{"title":"White-gray \/ Small \/ Female","offer_id":53617533059386,"sku":"CIUK02302S","price":49.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ Small \/ Male","offer_id":53617533092154,"sku":"CIUK02401S","price":49.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1006\/7047\/2506\/files\/defe4ec1.jpg?v=1781683484"},{"product_id":"iuk-two-piece-7-merino-wool-blend-base-layer-set-thermal-underwear-skiing-cold-weather-quick-dry-moisture-wicking-breathable-1","title":"IUK Two Piece 7% Merino Wool Blend Base Layer Set Thermal Underwear Skiing Cold Weather Quick-Dry Moisture Wicking Breathable","description":"\u003cul\u003e\n\u003cli\u003eSIZE GUIDE – FOLLOW SIZE CHART, NOT YOUR USUAL SIZE: The size label on the garment follows Asian sizing and will appear about 2 sizes larger than your ordered US size (THIS IS NORMAL). Please select your size strictly based on the size chart measurements. This men’s slim-fit base layer is designed for a close, athletic fit—ideal for skiing, running, hiking, and winter sports.\u003c\/li\u003e\n\u003cli\u003eMERINO WOOL BLEND PERFORMANCE FABRIC – 7% WOOL: Made with a high-performance blend (7% wool, plus polyester, nylon, lyocell, and spandex), this is NOT 100% wool. It delivers better stretch, durability, and shape retention than traditional merino wool base layers. Unlike pure wool thermals that may lose elasticity over time, this fabric maintains flexibility and structure after repeated wear and washing.\u003c\/li\u003e\n\u003cli\u003eACTIVE THERMAL BASE LAYER – BUILT FOR MOVEMENT: Designed for active use like skiing, hiking, running, and training—not for extreme cold while staying still. This men’s thermal underwear provides lightweight warmth with excellent breathability. Strategic ventilation zones at the chest, back, and underarms help regulate body temperature during movement.\u003c\/li\u003e\n\u003cli\u003eADVANCED MOISTURE-WICKING \u0026amp; SEAMLESS COMFORT: Stay dry with one-way moisture transport technology that pulls sweat away from the skin. 3D ventilation panels at the underarms, wave structure on the back, and honeycomb mesh zones accelerate airflow and evaporation. Seamless construction reduces chafing, while targeted compression at knees and elbows enhances support and performance.\u003c\/li\u003e\n\u003cli\u003eDURABLE, ODOR-RESISTANT \u0026amp; EASY CARE: Built for long-term performance, this men’s base layer set is machine washable and retains its shape after repeated washes. Natural wool fibers help reduce odor, while the stretch fabric ensures a secure fit during intense activity. Perfect for skiing, snowboarding, running, gym workouts, hunting, and outdoor winter adventures.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"IUK","offers":[{"title":"Black \/ Medium \/ Female","offer_id":53617551638842,"sku":"CIUK02301M","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ Small \/ Female","offer_id":53617551671610,"sku":"CIUK02301S","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ X-Small \/ Female","offer_id":53617551704378,"sku":"CIUK02301XS","price":59.99,"currency_code":"USD","in_stock":true},{"title":"White-gray \/ Medium \/ Female","offer_id":53617551737146,"sku":"CIUK02302M","price":59.99,"currency_code":"USD","in_stock":true},{"title":"White-gray \/ X-Small \/ Female","offer_id":53617551769914,"sku":"CIUK02302XS","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ Medium \/ Male","offer_id":53617551802682,"sku":"CIUK02401M","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ X-Small \/ Male","offer_id":53617551835450,"sku":"CIUK02401XS","price":59.99,"currency_code":"USD","in_stock":true},{"title":"White-gray \/ Medium \/ Male","offer_id":53617551868218,"sku":"CIUK02402M","price":59.99,"currency_code":"USD","in_stock":true},{"title":"White-gray \/ Small \/ Male","offer_id":53617551900986,"sku":"CIUK02402S","price":59.99,"currency_code":"USD","in_stock":true},{"title":"White-gray \/ X-Small \/ Male","offer_id":53617551933754,"sku":"CIUK02402XS","price":59.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1006\/7047\/2506\/files\/5d73dcfb.jpg?v=1781683484"},{"product_id":"two-piece-7-merino-wool-blend-base-layer-set-thermal-underwear-skiing-cold-weather-quick-dry-moisture-wicking-breathable","title":"Two Piece 7% Merino Wool Blend Base Layer Set Thermal Underwear Skiing Cold Weather Quick-Dry Moisture Wicking Breathable","description":"\n      \u003cdiv\u003e\n        \n        \n          \u003ch3\u003eAbout this item\u003c\/h3\u003e\n          \u003cul\u003e\n            \u003cli\u003eSIZE GUIDE – ORDER BY SIZE CHART, NOT YOUR USUAL SIZE: The size tag sewn on the clothing follows Asian sizing and will SHOW ABOUT 2 SIZES LARGER than your ordered size (THIS IS NORMAL). Please choose your size based on the size chart measurements. This slim-fit women’s base layer set is designed for a close athletic fit for skiing, hiking, running, and winter sports.\u003c\/li\u003e\n\u003cli\u003eMERINO WOOL BLEND PERFORMANCE FABRIC – 7% WOOL: This is a performance wool blend base layer containing 7% wool, not 100% wool. The fabric combines wool with polyester, nylon, lyocell, and spandex to provide better stretch, shape retention, and durability than 100% wool thermal underwear. Unlike pure wool base layer sets that may stretch out and lose elasticity after workouts and washing, this women's merino wool base layer maintains its shape and flexibility for long-term use.\u003c\/li\u003e\n\u003cli\u003eACTIVE THERMAL BASE LAYER – DESIGNED FOR MOVEMENT: Best for skiing, hiking, running and active use. Not designed as a heavyweight thermal for sitting still in extreme cold. This women’s thermal underwear provides warmth while remaining lightweight and breathable. Ventilation mesh at the chest, underarms, and back helps regulate temperature during activity.\u003c\/li\u003e\n\u003cli\u003eADVANCED MOISTURE-WICKING \u0026amp; SEAMLESS COMFORT: Stay dry and comfortable with moisture-wicking one-way transport technology that pulls sweat away from your skin. Armpit 3D ventilation and honeycomb mesh panels accelerate evaporation to reduce post-workout chills. Seamless knitting minimizes friction and irritation, while targeted compression at knees and elbows provides support during skiing, hiking, and training.\u003c\/li\u003e\n\u003cli\u003eDURABLE \u0026amp; EASY CARE PERFORMANCE THERMAL SET: Built for long-lasting performance, this women’s thermal underwear set is machine washable and retains its shape after repeated washes. Natural wool fibers help reduce odor, while the stretch fabric keeps a secure fit even after intense activity. Ideal for skiing, snowboarding, running, gym workouts, and outdoor winter adventures.\u003c\/li\u003e\n          \u003c\/ul\u003e\n        \n        \n          \u003ch3\u003eProduct Details\u003c\/h3\u003e\n          \u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\" style=\"border-collapse: collapse;\"\u003e\n            \u003cthead\u003e\n              \u003ctr\u003e\n                \u003cth style=\"text-align:left;\"\u003eProperty\u003c\/th\u003e\n                \u003cth style=\"text-align:left;\"\u003eValue\u003c\/th\u003e\n              \u003c\/tr\u003e\n            \u003c\/thead\u003e\n            \u003ctbody\u003e\n              \n                \u003ctr\u003e\n                  \u003ctd\u003easin\u003c\/td\u003e\n                  \u003ctd\u003eB0GSW1FCF3\u003c\/td\u003e\n                \u003c\/tr\u003e\n              \n                \u003ctr\u003e\n                  \u003ctd\u003ebest sellers rank\u003c\/td\u003e\n                  \u003ctd\u003e#1,789 in Women's Workout Top \u0026amp; Bottom Sets\u003c\/td\u003e\n                \u003c\/tr\u003e\n              \n                \u003ctr\u003e\n                  \u003ctd\u003edate first available\u003c\/td\u003e\n                  \u003ctd\u003eSeptember 25, 2025\u003c\/td\u003e\n                \u003c\/tr\u003e\n              \n                \u003ctr\u003e\n                  \u003ctd\u003edepartment\u003c\/td\u003e\n                  \u003ctd\u003emens\u003c\/td\u003e\n                \u003c\/tr\u003e\n              \n            \u003c\/tbody\u003e\n          \u003c\/table\u003e\n               \n\n      \u003c\/div\u003e\n    ","brand":"IUK Sport","offers":[{"title":"Black \/ X-Small \/ Female","offer_id":53621540847930,"sku":"B0G11GJVXB","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ Medium \/ Female","offer_id":53621541110074,"sku":"B0G11CHDB4","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ Medium \/ Male","offer_id":53621541273914,"sku":"B0G11MZ6XD","price":59.99,"currency_code":"USD","in_stock":true},{"title":"White-gray \/ X-Small \/ Male","offer_id":53621541470522,"sku":"B0G11HZ4W3","price":59.99,"currency_code":"USD","in_stock":true},{"title":"White-gray \/ Small \/ Male","offer_id":53621541667130,"sku":"B0G11BY8H5","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ Small \/ Female","offer_id":53621541798202,"sku":"B0G11Y36F4","price":59.99,"currency_code":"USD","in_stock":true},{"title":"White-gray \/ Medium \/ Female","offer_id":53621541896506,"sku":"B0G11NK6G9","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ X-Small \/ Male","offer_id":53621541962042,"sku":"B0G11JDB1X","price":59.99,"currency_code":"USD","in_stock":true},{"title":"White-gray \/ Medium \/ Male","offer_id":53621541994810,"sku":"B0G11CCDZJ","price":59.99,"currency_code":"USD","in_stock":true},{"title":"White-gray \/ X-Small \/ Female","offer_id":53621542027578,"sku":"B0G11WDLBK","price":59.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1006\/7047\/2506\/files\/612KCSZlJpL._AC_SL1500.jpg?v=1781765335"}],"url":"https:\/\/iuksport.com\/collections\/thermal-base-layers.oembed","provider":"IUK Sport","version":"1.0","type":"link"}