The athletic fit of the KJUS Second Skin 1/2 Zip helps support your muscles and keep you warm while out on the slopes or doing anything in the cold This base layer features no side seam for added comfort elastic sleeve cuffs for less movement and no shoulder seam for added comfort all around Whatever your activity use the Second Skin for added warmth comfort and protection 92pct polyester / 8pct spandex Ergonomic seams for perfect fit Flat lock stitching for chafe free fit No side seam for maximum wearing comfort No shoulder seam for maximum wearing comfort Half zip opening with YKK reg zipper Double lip zipper garage for optimal comfort Elastic sleeve cuffs keep cold air out of sleeves Raglan sleeves