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) 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 cold weather field coat liner and trouser liner serve as an insulating layer for the ECWCS.

The polyester fiberpile shirt serves as the primary insulating layer on the upper body.The bib overall is used as an additional layer for temperatures below -25°F (-32°C) and down to -60°F (-51°C).

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 underwear layer next to the skin acts as a moisture wicking layer and serves to draw moisture away from the skin, transferring it to the outer layers of 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 shirt and overalls replace polyester fiberpile shirt and bib overall.

Lightweight Cold Weather Underwear Set (LWCWUS) was developed to provide a moisture wicking, heat retentive, lightweight garment for moderate conditions not sufficiently cold for the polypropylene underwear.

The undershirt and drawers are designed to be worn next to skin by itself and to transfer moisture from the skin to the outside of the fabric where it spreads rapidly for quicker evaporation.

The shirt and drawers are designed to provide light insulation for use in mild climates as well as a base layer for colder climates, worn next to skin by itself or in conjunction with other levels (level I) for added insulation and to aid in the transfer of moisture.Fabric is slightly different than level I in that it provides extra warmth but still wicks moisture away from the skin to allow for quicker evaporation.

The jacket and trousers are designed for use in moderate to cold weather conditions as a soft shell layer combined with other base and insulative layers.The jacket and trousers provide light weight, low bulk and extreme comfort for movement.

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 parka and trousers are the outermost level of protection in the system designed for use during static operations in extreme cold, dry conditions.

The LEP layer 1 silkweight undershirt and drawers are intended for wear as a moisture wicking layer of the ECWCS.

The LEP layer 2 midweight undershirt and drawers are intended for wear as an insulation layer of the ECWCS.

The LEP layer 3 midweight stretch bib overall is intended for wear as an insulation layer of the ECWCS.

The M-1950 snow camouflage trousers are intended for wear as an outer garment to provide camouflage in snow areas.

The M-1950 winter underwear serves as inner layer in cold-wet and cold-dry climate.

The M-1951 arctic trouser ensemble is made up of a shell and a detachable mohair frieze liner which is attached inside the shell. The trousers are worn over the field trousers when the soldier must remain inactive (in a listening post, for example) and when temperatures of -50 to -60°F (-46 to -51°C) are encountered.

The M-1951 wool field trousers are intended for wear as a component of the cold-wet uniform ensemble.

The M-1951 field trouser ensemble is made up of a shell and a detachable mohair frieze liner which is attached inside the shell for extra warmth. The shell is worn over wool trousers as the outer layer in cold-wet climate or worn with the liner as the intermediate layer in cold-dry climate.

The M-65 cold weather field trouser liner is buttoned into field trousers for extra warmth, and also can be worn as a separate garment to serve as an insulating layer for the ECWCS.

The M-65 cold weather field trousers serve as outer layer in cold-wet climate or as intermediate layer in cold-dry climate, and also serve as a durable insulating layer of ECWCS to be worn over the liners when the outer extended cold weather trousers are not needed.

The M-65 snow camouflage trousers are intended for wear in cold dry areas as supplimentary trousers with attached liner.

The M-65 cold weather underwear serves as inner layer in cold-wet and cold-dry climate.

The ECW parka and trouser overgarments and booties are designed for biouvac, rest and sentry activities in mountain conditions.The garments shall be lightweight and easily packed to a minimum volume to be carried among the variety of other mission essential gear.

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

The snow camouflage parka, trousers and pack cover are designed to be worn as over-garments when snow camouflage protection is required.

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

The ECW trousers, together with the ECW parka and booties, are designed for bivouc, rest and sentry activities in mountain conditions.

The mid-weight FR grid fleece underwear is a flame resistant version of the polyester grid fleece underwear.It will provide improved moisture management, insulation and comfort when worn in intermediate to cold weather environments. In addition, it will provide Marines with FR protection when needed. The FR Grid Fleece can be worn as part of the Mountain Cold Weather Clothing System or Flame Resistant Organizational Gear (FROG).

The mid-weight grid fleece underwear is intended for wear by male and female military personnel of the USMC in mountainous and cold weather environments.It will provide improved moisture management, insulation and comfort when worn in intermediate to cold weather environments.It will be part of the Mountain/Cold Weather Clothing System and will replace the current polypropylene underwear set, and fleece pullover.

The FR next-to-skin underwear is a flame resistant version of the polyester silkweight underwear.It will provide improved moisture management and comfort when worn in intermediate to cold weather environments. In addition, it will provide Marines with FR protection when needed. The FR Silkweight Underwear can be worn as part of the Mountain Cold Weather Clothing System or Flame Resistant Organizational Gear (FROG).

The new next-to-skin underwear is intended for wear by male and female military personnel of the USMC in mountainous and cold weather environments.It will provide improved moisture management and comfort when worn in intermediate to cold weather environments.It will be part of the Mountain/Cold Weather Clothing System and will also replace the current lightweight CW underwear set.

The Army Combat Pant (ACP) is a flame-resistant pant designed for use in rugged combat environments. The ACP provides the Soldier with increased durability and enhanced features over the current Fire Resistant Army Combat Uniform (FRACU) trouser.

The FREE system t-shirt and boxer briefs next-to-skin layer is constructed with a tri-blend of lenzing FR rayon fiber, wool, and nylon. This layer is extremely lightweight and breathable to allow high moisture movement and quick drying.

The FREE system undershirt and drawers base layer is constructed with a lightweight moisture wicking and breathable lycra mesh fabric made with DuPont Nomex fiber. This base layer provides maximum comfort and excellent recovery properties in hot climate, and can be worn under other layers like the mid-weight shirt and drawers for additional protection for cold weather.

The FREE system mid-weight shirt and drawers base layer is constructed with a quick-drying, high loft Polartec thermal FR fleece made with DuPont Nomex fiber for optimal warmth and breathability without weight. This fleece layer provides maximum comfort when worn over base layers and underneath the uniform.

The FREE system light weather outer layer (LWOL) soft shell jacket and trousers are constructed with a lightweight, windproof, waterproof, breathable Massif Elements Lite 4-way stretch fabric made with DuPont Nomex fiber. The jacket features high collar for added protection, zippered chest and sleeve cargo pockets, and two flapped double pen pockets. The LWOL jacket is also engineered with an easy-cinch draw cord and adjustable wrist cuffs for variable fit and warmth, a pass-through flap for CVC extraction strap access, and velcro loop for name, rank, flag, and unit tape round out the LWOL's functionality.

The FREE system intermediate weather outer layer (IWOL) jacket, vest and trousers are constructed with an abrasion resistant Massif Elements 4-way stretch fabric made with DuPont Nomex fiber. Its windproof, waterproof, and breathable membrane helps to keep elements out without trapping sweat and soft fleece interior keeps the war-fighter warm and protected from the elements. The IWOL jacket and vest also feature velcro loops for name, rank, flag, and unit tape.

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 Enhanced Flame Resistant Combat Ensemble (EFRCE) consists of a blouse and trousers that make up a set. Although the EFRCE is similar to the current Flame Resistant Combat Ensemble, the design and fabrics used to construct the ensemble have been modified to increase durability.

The Flame Resistant Combat Ensemble is comprised of a high performance protective blouse and protective trousers that will provide the protection, safety and comfort features required by Flame Resistant Organizational Gear.

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.

Commercial item description A-A-55246 covers the technical requirements for polypropylene undershirt and drawers, components of ECWCS.

Military specification MIL-D-10212 covers M1950 winter drawers.

Military specification MIL-D-43261 covers men's cold weather wool/cotton drawers.

Military specification MIL-D-44165 covers polypropylene drawers used as a component of ECWCS.

Detail specification MIL-DTL-32158 covers the requirement for APECS trousers.

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

Detail specification MIL-DTL-32621 covers flame resistant, lightweight, cold weather drawers.

Detail spcification MIL-DTL-32624 covers flame resistant, mid-weight, cold weather drawers.

Military specification MIL-L-11787 covers a wool liner which is attached inside the arctic shell trousers.

Military specification MIL-L-11788 covers a mohair frieze liner for M-1951 field trouser shell.

Military specification MIL-L-43498 covers a trouser liner made from quilted polyester batting material, for the cold weather field trousers.

Military specification MIL-L-43672 covers a trouser liner made from quilted polyester batting material.

Military specification MIL-O-44191 covers a pair of synthetic fiber pile overalls used as a component of the ECWCS.

Military specification MIL-T-11100.

Military specification MIL-T-11786 covers the arctic shell trousers.

Military specification MIL-T-1867.

Military specification MIL-T-1870 covers the requirements for trousers made from wool material.

Military specification MIL-T-1880.

Military specification MIL-T-2027 covers snow camouflage trousers.

Military specification MIL-T-2060 covers the M-1951 field trouser shell.

Military specification MIL-T-43497 covers water repellent sateen trousers with leg cargo pockets.

Military specification MIL-T-43654 covers snow camouflage, white arctic trousers.

Military specification MIL-T-43932 covers polyester/cotton durable press utility trousers.

Military specification MIL-T-44047 covers camouflage pattern combat trousers.

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

Military specification MIL-T-838 initially covered trousers made of OD-7 herringbone twill cloth, and then trousers made of OG-107 cotton sateen cloth.

Purchase description GL/PD-06-14 covers the requirements for lightweight drawers, which serve as a layer of the GEN III ECWCS.

Purchase description GL/PD-06-15 covers the requirements for synthetic grid fleece drawers, which serve as a layer of the GEN III ECWCS.

Purchase description GL/PD-06-16 covers the requirements for a soft shell trouser, 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 GL/PD-06-18 covers requirements for insulated loft trousers, which serve as a layer of the GEN III ECWCS.

Purchase description GL/PD 07-14 covers the requirements for combattrousers, a component of the army combat uniform.

Purchase Description specification covers the requirements for unisex and female combat trouser to be worn by the Army.

This purchase description covers the requirements for the Marine Corps enhanced flame resistant combat ensemble, blouse and trouser.

Performance specification MC/PS 02-2015 SYSCOM prescribes the performance requirements and identifies verification procedures for the U.S. Marine Corps flame resistant lightweight cold weather underwear set drawers.

Performance specification MC/PS 03-2015 SYSCOM prescribes the performance requirements and identifies verification procedures for the US Marine Corps flame resistant midweight cold weather underwear set drawers.

This performance specificaiton covers the requirements for the Marine Corps snow extreme cold weather (ECW) parka and trouser overgarments and bootie for biouvac, rest and sentry activities in mountain conditions.

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