ColdPruf's thermal underwear for men can be worn on its own or as a base, mid, or outer layer. The Journey Performance is a single-layer long-sleeve crew neck top made of 100% polyester. Our long-sleeve tops for men feature an extended body and sleeves for the ultimate athletic fit. Our men's long underwear top also offers moisture management and odor control on the fabric via Intellifresh(tm) powered by Silvadur(tm) technology. ColdPruf Journey men's thermal tops are our most versatile layer; great for layering, casual wear, or active wear in cold to very cold environments, whether at home, on the job, or enjoying the outdoors.