Black E.C.W.C.S. Gen III Mid-Weight Thermal Bottoms Constructed of 93% polyester and 7% spandex with breathable grid fleece. The zipper collar can become a turtle neck for added warmth. Thumbholes are. Available on sleeves. Treated with microban to prevent odors and microbials that are often in underclothing. SKU: 69034. Available in Sizes S-XL. Manufactured by Rothco.