Polyester. Extra warm - can be worn as a jacket or jacket liner for the ECWCS parkas. Upper body and elbow patches. Full front zipper. Armpit zippers. 2 front slash zipper pockets. 2 inside mesh pockets. Drawstring waistband and hook and loop sleeve adjustments. Warm fleece shirt for outdoor cold weather use and can be worn alone as a fall/winter jacket without ECWCS parka. ECWCS - Extended/Extreme Cold Weather Clothing System. Black.