The US Military Woodland M81 insulating helmet liner cap is a cold weather field cap designed to provide thermal protection in low temperature environments. It features fold down ear coverage and can be worn under helmets or as standalone headgear.

• Color: Woodland M81
• Material: Nylon cotton shell with fleece or pile lining
• Function: Thermal insulation for head and ear protection in cold weather

Issued to U.S. military personnel for cold weather field operations.