The Wet Weather Poncho Liner, also informally known as a Woobie, is a piece of field gear originating in the United States military. The USMC Woobie can be attached to a standard issue poncho. The USMC Poncho Liner is a versatile piece of kit that is usable as a blanket, sleeping bag or protective cover. The USMC Poncho Liner retains heat even when wet. The USMC Poncho Liner is constructed with a nylon outer shell with a polyester filling. It is attached to the poncho with shoe lace like strings that loop through holes in the poncho.