ArcticShield Men's Boot Insulator 100% Polyester Imported RETAIN patented heat retention technology for added warmth Easily fits over boots and shoes. Available in Sizes Small-2X-Large. Windproof; water resistant, 100% polyester tricot fabric Packable - roll up to fit in your pocket or backpack; Lightweight, compact Drawcord adjustment for a snug fit, and heavy-duty locking zipper