Adaptable 1/2-zip pullover made from Mountain Hardwear's polyester-blend stretch fabric.The New Butterman 1/2 Zip is made from a blended fabric that's 85% polyester, for excellent technical performance, and 15% elastane, for stretch and mobility. Quick to dry, it's as comfortable and easygoing as it is easy to care for--a new classic. Stylish solid-and-stripe pattern.