ColdPruf Men's Basic Base Layer Long Sleeve Shirt - The BASIC 2 layer engineering traps air between the layers providing a natural barrier or warmth. The inside and outside layers are a blend of 60% combined ring spun cotton and 40% polyester offering the comfort and warmth you deserve. The Basic has been designed for wear in Cold to Very Cold Weather with Low to Medium Activity. The BASIC delivers comfort and warmth in all cold weather environments, whether at home, on the job or enjoying the great outdoors. Two-layer engineering Traps air between layers providing a natural barrier of warmth Fabric weight: 149g Tagless design and flat seams provide a smooth fit and extra comfort Rib cuffs and drop tail for added protection against cold Style: 90