Why wear a bunch of bulky layers to warm up if you don't have to? The GSX Pro-Thermal Long-Sleeve Crew Tee delivers optimum warmth and comfort in a single layer. Double-knit 100% polyester fabric wicks away moisture so you stay dry, while built-in UPF 30+ sun protection shields your skin against harmful UV rays. Contoured seam stitching offers enhanced freedom of movement for even greater comfort. Reflective trim increases visibility and safety in low-light conditions. Imported.