Lightweight, warm and great for layering. With its soft hand feel and consistent warmth from collar to hem, the Microchill Zip T is tailor-made for slipping over a base layer, wearing as a light standalone pullover or for added warmth under a shell. Its lightweight and versatility makes it perfect for packing in. 100% polyester. Feature: flat-lock construction eliminates chafe, high-cut collar with 12'' zip for thermoregulation, chin guard for comfort. Material: Polyester.