The Browning Men's Short Sleeve Sun Shirt is made from a lightweight, sweat-wicking polyester-spandex blend fabric. The combination of that unique material and loose-fit design not only delivers breathable comfort and a free range of motion, but also helps to block 98% of harmful UVA and UVB sun rays, giving this sun shirt a very high SPF rating of UPF 50+. To further help protect you, the shirt has sewn-in Browning Reactar G3 pad pockets in right and left shoulders(pad sold separately).