{"product_id":"rothco-gen-iii-silk-weight-base-layer-top","title":"Rothco Gen III Silk Weight Base Layer Top","description":"\u003cp class=\"product-lead\"\u003eThe Rothco Gen III Silk Weight Underwear Top is a men's cold-weather base layer built on the ECWCS Level I standard, made from 100% polyester jersey knit that wicks moisture and resists odor during extended wear. Available in Black and AR 670-1 Coyote Brown, with sizes running from S through 3XL in Black and S through 2XL in Coyote Brown.\u003c\/p\u003e\n\n\u003ch2\u003eLightweight Warmth Without Bulk\u003c\/h2\u003e\n\u003cp\u003eThe jersey knit construction keeps the top light enough to wear under any additional layer without restricting movement or adding noticeable bulk. As the ECWCS Level I garment, this top functions as the innermost layer of the Extended Cold Weather Clothing System, trapping body heat close to the skin where it matters most in cold conditions.\u003c\/p\u003e\n\n\u003ch2\u003eMoisture Management During Active Use\u003c\/h2\u003e\n\u003cp\u003eThe 100% polyester fabric draws sweat away from the skin and moves it outward, keeping the wearer dry during physical activity in cold weather. Staying dry at the base layer is critical for maintaining warmth: wet fabric against skin accelerates heat loss, so effective moisture-wicking at this layer supports the performance of every layer above it. The fabric is also designed to resist odor buildup during extended wear, which matters on multi-day operations or field rotations where laundry access is limited.\u003c\/p\u003e\n\n\u003ch2\u003eCoverage Details That Add Up\u003c\/h2\u003e\n\u003cp\u003eA long back tail keeps the top tucked and the lower back covered during movement, eliminating the cold gap that shorter base layers leave when bending or reaching. Thumb-hole sleeves extend coverage to the wrist and prevent the sleeve from riding up under gloves or an outer layer, maintaining an unbroken warm zone from shoulder to hand.\u003c\/p\u003e\n\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eECWCS Level I:\u003c\/strong\u003e Designed as the base layer of the Extended Cold Weather Clothing System.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e100% Polyester Jersey Knit:\u003c\/strong\u003e Lightweight construction with moisture-wicking performance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOdor Resistance:\u003c\/strong\u003e Fabric is designed to prevent unpleasant odors during extended wear.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLong Back Tail:\u003c\/strong\u003e Maintains coverage and stays tucked during active movement.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThumb-Hole Sleeves:\u003c\/strong\u003e Extend sleeve coverage and prevent ride-up under gloves or outer layers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eSpecification\u003c\/th\u003e\n      \u003cth\u003eDetail\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMaterial\u003c\/td\u003e\n      \u003ctd\u003e100% Polyester\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eConstruction\u003c\/td\u003e\n      \u003ctd\u003eJersey knit\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSystem\u003c\/td\u003e\n      \u003ctd\u003eECWCS Level I\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eWeather Rating\u003c\/td\u003e\n      \u003ctd\u003eCold weather\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eGender\u003c\/td\u003e\n      \u003ctd\u003eMen's\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eAvailable Colors\u003c\/td\u003e\n      \u003ctd\u003eBlack; AR 670-1 Coyote Brown\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eAvailable Sizes (Black)\u003c\/td\u003e\n      \u003ctd\u003eS, M, L, XL, 2XL, 3XL\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eAvailable Sizes (Coyote Brown)\u003c\/td\u003e\n      \u003ctd\u003eS, M, L, XL, 2XL\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWho This Is For and Isn't\u003c\/h2\u003e\n\u003cp class=\"product-fit-yes\"\u003eThis top suits men who need a lightweight, moisture-managing base layer for cold-weather field use, military or tactical operations, hunting, or outdoor work where layering is required. It is sized for adults and fits into the ECWCS layering system as the Level I piece.\u003c\/p\u003e\n\u003cp class=\"product-fit-no\"\u003eThis is not a standalone cold-weather garment and is not designed to provide warmth on its own without additional insulating layers. AR 670-1 Coyote Brown is not available above 2XL in this product. This top provides no ballistic, stab, or slash protection of any kind.\u003c\/p\u003e\n\n\u003ch2\u003eCommon Questions\u003c\/h2\u003e\n\u003ch3 class=\"product-faq-q\"\u003eWhat does ECWCS Level I mean for this top?\u003c\/h3\u003e\n\u003cp class=\"product-faq-a\"\u003eECWCS stands for Extended Cold Weather Clothing System, a layered military cold-weather standard. Level I is the base layer: the garment worn directly against the skin. The Rothco Gen III Silk Weight Underwear Top fills that role, managing moisture and trapping initial body heat to support the performance of insulating and outer layers worn over it.\u003c\/p\u003e\n\u003ch3 class=\"product-faq-q\"\u003eIs this top suitable for wear under a plate carrier or tactical vest?\u003c\/h3\u003e\n\u003cp class=\"product-faq-a\"\u003eYes. The lightweight jersey knit and close fit of the Rothco Gen III Silk Weight Underwear Top are well suited to wearing under a plate carrier, tactical vest, or body armor. The thumb-hole sleeves and long back tail help the top stay in place under load-bearing gear during extended movement.\u003c\/p\u003e\n\u003ch3 class=\"product-faq-q\"\u003eHow does the moisture-wicking work in cold weather?\u003c\/h3\u003e\n\u003cp class=\"product-faq-a\"\u003eThe 100% polyester fabric in the Rothco Gen III Silk Weight Underwear Top pulls sweat away from the skin and moves it toward the outer surface of the fabric, where it can evaporate or be absorbed by the next layer. This keeps the skin drier and reduces the heat loss that wet fabric against skin causes in cold conditions.\u003c\/p\u003e\n\u003ch3 class=\"product-faq-q\"\u003eDoes Coyote Brown meet AR 670-1 color standards?\u003c\/h3\u003e\n\u003cp class=\"product-faq-a\"\u003eThe Coyote Brown variant of the Rothco Gen III Silk Weight Underwear Top is listed as AR 670-1 Coyote Brown, indicating the color is matched to the Army Regulation 670-1 standard. Buyers with specific uniform compliance requirements should verify against their unit's current guidance.\u003c\/p\u003e","brand":"Rothco","offers":[{"title":"Black \/ S","offer_id":67127768514931,"sku":"RTC-64020-BK-S","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ M","offer_id":67127768547699,"sku":"RTC-64020-BK-M","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ L","offer_id":67127768580467,"sku":"RTC-64020-BK-L","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ XL","offer_id":67127768613235,"sku":"RTC-64020-BK-XL","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ 2XL","offer_id":67127768646003,"sku":"RTC-64021","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ 3XL","offer_id":67127768678771,"sku":"RTC-64022","price":28.99,"currency_code":"USD","in_stock":true},{"title":"AR 670-1 Coyote Brown \/ S","offer_id":67127768711539,"sku":"RTC-3725-CCB-S","price":23.99,"currency_code":"USD","in_stock":true},{"title":"AR 670-1 Coyote Brown \/ M","offer_id":67127768744307,"sku":"RTC-3725-CCB-M","price":23.99,"currency_code":"USD","in_stock":true},{"title":"AR 670-1 Coyote Brown \/ L","offer_id":67127768777075,"sku":"RTC-3725-CCB-L","price":23.99,"currency_code":"USD","in_stock":true},{"title":"AR 670-1 Coyote Brown \/ XL","offer_id":67127768809843,"sku":"RTC-3725-CCB-XL","price":23.99,"currency_code":"USD","in_stock":true},{"title":"AR 670-1 Coyote Brown \/ 2XL","offer_id":67127768842611,"sku":"RTC-3726","price":25.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1926\/7025\/files\/64020-RIGHT-C.webp?v=1792120812","url":"https:\/\/bulletproofzone.com\/products\/rothco-gen-iii-silk-weight-base-layer-top","provider":"Bulletproof Zone","version":"1.0","type":"link"}