The summit can be cold, this half-zip pullover with thermal wicking will keep you cool and dry on the way up, and then warm and comfortable on the way down. It also features reflective detailing for added safety and style. Modern classic fit shirt made of 87% polyester and 13% elastane feature Omni-Heat thermal reflective, Omni-Wick, reflective detail and flatlocked construction. Material: Polyester, Elastane.