Waterproof and moisture vapor permeable cloth is used in fabrication of bivy covers for the modular sleeping system, rainsuits, parkas and trousers for the extended cold weather clothing system (ECWCS) including the second generation and the all-purpose environmental clothing system (APECS).

Specifications

• For ECWCS parka and trousers: MIL-C-44187, superseded by MIL-DTL-31011
• For APECS parka and trousers: MIL-PRF-32142