The Ex Officio Men's Sol Cool Long Sleeve Crew utilizes Icefil technology to create the ultimate active shirt for hot weather. Xylitol, a naturally occurring compound found in the birch tree, is bound to the fabric fibers and cools the body up to three degrees upon contact with moisture, which is wicked away from the skin. The Sol Cool Crew Shirt is also rated UPF Sun Guard 50 for optimal sun protection. Constructed of 91% polyester, 9% spandex Sol Cool Jersey fabric. Icefil fabric uses Xylitol to create a cooling sensation on contact with moisture to lower body temperature up to three degrees. Critical seams moved off the shoulder to prevent rubbing. Intelligent moisture control technology provides exceptional wicking. Sun Guard 50, the highest rating available for a garment. Underarm gusset for maximum mobility. Flat locked stitching and tagless label to prevent irritation. Active stretch fabric. Odor resistant. Quick drying. Lightweight. Avg length: 29.5 in. Import.