The Military Poncho Liner is a blanket used to provide warmth in milder climates. Most poncho liners can either be tied into a poncho or snapped into place creating a waterproof sleeping bag. The combination of the two provide a dry night's sleep protecting a person from the morning dew or drizzling wet weather environments and keeping them warm at night.
The Military Poncho Liner is commonly referred to by it's nickname, the "Woobie". Military woobies are a favorite among active military and veterans as well as outdoorsmen, adventurers, and survivalists.