The Sunshine Sport Half-Zip is a lightweight midlayer that provides natural UV protection which is perfect to protect your skin. It has the stretch and quick-drying comfort you look for on a sunny day, while mesh inserts on the arms add extra ventilation to keep you cool. 4 Way Stretch Fabric Quick Drying UV Protection (UPG 50+) Antibacterial Finish Style LG25-J04 Color 4003404 Size 42 = XL = 12