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.

The All Purpose Environmental Clothing System (APECS) parka, together with APECS trousers, was 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.

The All Purpose Environmental Clothing System (APECS) trousers, together with APECS parka, 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.

The extended cold weather parka and trousers are new ECWCS development items.The parka and trousers serve as the windproof, waterproof layer in the system.

The extended cold weather parka is a new ECWCS development item.The parka serves as part of the windproof, waterproof layer in the system.

The extended cold weather trousers are a new ECWCS development item.The trousers serve as part of the windproof, waterproof layer in the system.

The 2nd generation parka and trousers incorporates features requested by Marines. Improvements over the original parka and trousers include a two-way entry pocket design, water channels to protect critical area from potential leakage, removal of the taffeta nylon lining to reduce cost, improved breathability, a roll and stow hood, and a Cordura nylon reinforcement of the elbow and knee areas to improve durability.

The parka and trousers replace the original parka and trousers in the Army.

The jacket and trousers are designed for use in cold, wet conditions alternating between freezing and thawing as a hard shell layer combined with other base and insulative layers.The jacket and trousers provide a lightweight, completely waterproof, windproof and breathable level of protection against the elements.

The lightweight exposure jacket, together with the lightweight exposure trousers, is designed for wind and rain protection in mountain conditions.

The lightweight exposure jacket and trousers are designed for wind and rain protection in mountain conditions.

The lightweight exposure trousers, together with the lightweight exposure jacket, are designed for wind and rain protection in mountain conditions.

The FREE system extreme weather outer layer (EWOL) parka, fleece liner, and trousers are constructed with a lightweight, windproof, waterproof, and breathable Gore-tex fabric that combines the DuPont Nomex fiber outer material and the Gore-tex membrane. The EWOL jacket features a removable roll-and-stow hood and zip-in liner constructed from Polartec thermal FR fleece. The EWOL serves as the most external layer in the clothing system and is available in OCP or UCP.

The NWU parka is intended for use by US Navy personnel when weather conditions dictate and as the outer layer protection when used during cold/wet weather operations.

The Improved Rain Suit (IRS) forms a waterproof outer shell worn over other clothing and gear. It is lightweight; however, IRS functions strictly as a rain barrier, offering little protection from the cold.

Waterproof and moisture vapor permeable cloth is used in fabrication of bivy covers for the MSS, parkas and trousers for the ECWCS including 2nd generation and APECS.

Military specification MIL-C-44187 covers a three-layered laminated cloth which is waterproof and moisture vapor permeable.

Detail specification MIL-DTL-31011 covers the requirements for four types of camouflage cloth, which are waterproof and moisture vapor permeable.

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.

Detail specification MIL-DTL-32184 covers the requirement for the Army 2nd Generaton ECWCS parka and the detachable (optional) hood.

Detail specification MIL-DTL-32185 covers the requirement for the Army 2nd Generation ECWCS trousers.

Military specification MIL-P-44188 covers a nylon, three-layer laminated, waterproof, and moisture-vapor-permeable parka, a component of ECWCS.

Military specification MIL-T-44189 covers nylon, three layer laminated waterproof and moisture vapor permeable trousers used as a component of the ECWCS.

Purchase description GL/PD-06-06 covers the requirements for a waterproof, extreme cold/wet weather jacket, which serves as a layer of the GEN III ECWCS.

Purchase description GL/PD-06-17 covers the requirements for waterproof, extreme cold/wet weather trousers, which serve as a layer of the GEN III ECWCS.

Purchase description NCTRF PD 04-09 covers the requirements for the US Navy working uniform parka in desert and woodland camouflage.

Purchase description NCTRF PD 06-11 covers requirements for camouflage, waterproof and moisture vapor permeable cloths with Anchor, Constitution, and Eagle (ACE) printed logo.

Purchase description NCTRF PD 15-06 covers a waterproof, moisture-vapor-permeable parka that accepts a zip-in liner for use by US Navy personnel.

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.

This performance specification covers the requirements for the Marine Corps lightweight exposure jacket and trousers.