No need to worry about the sun any longer with the Patagonia Sol Patrol II Shirt. There is a UPF rating of 30 that will keep you protected from the harmful UV rays and you will stay cool thanks to the mesh lined vents at the back, sides and arm. A double layer collar can be popped up to keep the back of your neck protected should the sun coming blasting out. Relaxed Fit, UPF 30 Sun Protection, Double Layer Collar, Side Vents for Airflow, Mesh Lined Chest Pockets, Inset Zippered Pocket on Chest, Material: 100% Polyester Ripstop (45% Recycled) with 50+ UPF Sun Protection, Warranty: Lifetime, Closure Type: Button Up, Type: Shirt, Material: Synthetic, Sleeve Type: Short Sleeve, Recommended Use: Casual, Sun Protection: Yes, Model Year: 2019, Product ID: 555752, Model Number: 54235 RFBW M, GTIN: 0191743375729