The US Military Woodland M81 intermediate cold weather sleeping system bivy cover is a waterproof outer shell designed to protect sleeping bags in wet and cold environments. It is used as part of the modular sleep system to provide additional weather resistance and heat retention.

• Color: Woodland M81
• Material: Waterproof breathable Gore Tex fabric
• Function: Weather protection and moisture barrier for sleeping systems

Issued to U.S. military personnel as part of the Intermediate Cold Weather Sleep System.