Mountain Hardwear Scenic Route Short Sleeve Shirt 100% Nylon Venting eyelets under the arms for extra comfort when the temperature heats up. Made from high technology fabric that provides excellent sun protection with a UPF Rating of 25. Convenient upper sleeve and secret internal security pocket. Flip up collar for added protection against harmful UVA and UVB sun rays. Made from Summit stretch plainweave 93% Nylon and 7% elastane material.