This T-shirt is made from recycled polyester jersey fabric for lightweight comfort while you're trail running through the mountains or climbing at the crag. The Deltapeak™ technology offers breathability and quick-dry capabilities to prevent sweat from building up on warm days. This T-shirt also has advanced UV protection to keep the worst of the sun’s rays off you. With a high density fabric construction that ensures excellent snag-resistance, the men's Rock 2 T-shirt gives you all-day comfort on active summer days outdoors.