Built with active perspiration control and quick-dry fabric, this men's T-shirt is crafted with polyester stretch ultralight jersey fabric and will keep you comfortable on the hottest days and on your longest runs. The high air permeability and UV protection equals total protection from the sun while guaranteeing the breathability you need to stay cool. Whether you're running through the hills, hiking to the crag, or working out mid-week, our Topographic Sublime T-shirt keeps you comfortable and focused.