This is an AVIREX thermal t-shirt. It can be used as underwear, but it's thick enough to be worn as a long-sleeved T-shirt. The material is 95% cotton and 5% polyurethane. Condition: Purchased at a store and used a few times. Selling because the size is too big for me now. Please check the photos for the condition. Flat measurements (cm): Shoulder width: 51 Sleeve length: 66 Body width: 52 Length: 70 Size...XL (LL) Color...Black系 (Black) Sleeve length...Long sleeve Pattern/Design...Solid Stains, tears, odors, etc... None