ECWCS Generation III (GEN III) Level 1 Undershirt & Drawers, USGI/RFI Issue Genuine RFI-Issue GEN III Level 1 Undershirt and Drawers, in Desert Sand color Sold as either a complete set of the same size, OR as separate items (individual pieces). Mix & match as needed. Part of the U.S. Army Extended Cold Weather Clothing System (ECWCS) Constructed with Polartec Power Dry Silkweight material, this layer is highly breathable, wicks moisture away from the skin and dries fast, providing evaporative cooling in warmer weather and insulating in cool weather  all with less weight and bulk than previous systems. Proudly Made in the U.S.A.