The original 'Pepper' in the Hot Chillys Peppers Collection, Pepper Skins are your standard, dependable thermal underwear. Originally designed with the working professional in mind as a warm base layer, this men's base layer shirt features our staple Mtf polyester fibers, which work to transport moisture away from the skin as you go about your day. This men's crew neck thermal features a flat seam construction for seam strength, durability, and longevity and a relaxed fit for everyday comfortable use.