The All Purpose Environmental Clothing System (APECS) parka and trousers were developed to provide Marines with an all-purpose/all-season set of outershell garments that are lighter in weight, lower in bulk, have lower noise generation, are moisture vapor permeable and have an improved water repellency over the 2nd Generation ECWCS parka and trousers. The APECS also incorporates the Marine Pattern.
Detail specification MIL-DTL-32157 covers the requirement for APECS parka and a detachable (optional) hood.
Detail specification MIL-DTL-32158 covers the requirement for APECS trousers.
Purchase description PD 77 AESG 06-22 covers the requirements for one type of cloth, waterproof and mositure vapor permeable, Air Force digital tiger stripe, printed pattern used in the fabrication of Air FOrce garments.
Performance specification MIL-PRF-32142 covers the requirements for a waterproof, windproof, and moisture vapor permeable camouflage printed cloth which is intended for use in the fabrication of APECS parkas and trousers.