Port Authority Men's Pique Uv Sun Protection Moisture Short Sleeve Polo Shirt 100% Polyester Exceptionally breathable and comfortable, this polo has a UPF rating of 50 to resist UV rays and wicks moisture so you stay dry and comfortable all day long. 4.1-ounce, 100% polyester UPF rating of 50 Double-needle stitching throughout Flat knit collar