Not your ordinary Long Johns, these are official U.S. military "under drawers" for use as a mid-weight layer under either regular pants or extreme weather snow pants. PolartecA(R) grid fleece regulates temperature in cold conditions, maintaining core body temps while allowing moisture to wick away and evaporate during periods of intense activity. Long-wearing durability and comfort made to tough U.S. military specs. Level 2 of ECWS (Extended Cold Weather System) 93/7 polyester fleece / spandex Moisture-wicking PolartecA(R) grid fleece Pass-though fly Machine wash and dry Note: Color varies. No choice