This Mil-Tec(R) Poncho Liner is a rugged modern implementation of the classic U.S. military pattern (aka "woobie blanket") originally developed to handle rapidly changing temperatures in the highlands of Vietnam. Takes up very little space in your pack. Supplies essential warmth on cold nights. Can also be used as an extra layer of padding between a waterproof ground cover and your sleeping bag. Low-bulk, easy-packing blanket Quilted 100% polyester shell with polyester batting Includes stuff sack for storage and transport