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The US Military ECWCS Light Weight Thermal Underwear is the Layer-1 component of the 7-Layer ECWCS that is utilized by the US military. Constructed from lightweight Polartec Power Dry material, these cold weather underwear will keep you warm and comfortable in cold weather. When utilized with a layered approach like the military 7-Layer system these thermal underwear make up the important foundation of your cold weather fighting clothing.