US Military OD Green Desert Night Cold Weather Parka Liner Size:XLarge They are worn over standard

They are worn over standard uniforms during winter and arctic field operations

The USMC Coyote Brown Eagle Industries Hydration Pack is a compact hydration carrier designed for field operations

Army personnel as part of the Army Combat Uniform (ACU) system

military personnel as part of the ALICE system

They provide breathability

US Military OD Green Desert Night Cold Weather Parka Liner Size:XLarge They are worn over standardThe US Military OD Green Desert Night cold weather parka liner is a removable insulated liner designed for use inside compatible cold weather parkas. It is used to add thermal insulation and improve warmth retention in cold field conditions. Color: Olive Drab Green Material: Nylon shell with synthetic insulation Function: Cold weather insulation liner for parka systems Issued for use with U. S. military cold weather outerwear systems.