Don't run from the sun; embrace it with Simms Solarflex Long Sleeve CrewneckFly Fishing Shirt. The fabric is rated atUPF 50, meaning that it does an excellent job of blocking harmful UV rays from the skin. The COR3 technology provides anglers with moisture-wicking and quick-drying performance while also fighting odor-causing bacteria on long hot days. Stay outdoors longer, wearing the Simms SolarflexLong SleeveCrewneckMen's Shirt. Flat-seam construction for comfort Articulated arms for best movement High collar for better sun protection Moisture-management for comfort.