G.I. cold weather shirt also called the "bear shirt" by our troops! They are used as the middle layer for the ECWCS system,(On top of the polypro shirt and under the Gore-tex jacket) and wow are they warm! Made from 100% polyester fleece and these are brand new! Note: These run a little small.Medium fits about 150 pounds.Large fits about 175 pounds and an Extra-Large fits about 200 pounds.These are new right out of the government box and still in their original packaging!