On the trail run from Big Meadow to Echo Summit, you cant count on breezes to keep you cool, but you can mitigate the summer heat with this airy crew. Worn alone, it provides 50+ UPF sun protection, superior stretch and a cool, drying airflow. Paired with another layer, it wicks moisture and adds some warmth when temperatures drop. Made with our stretchiest Capilene performance baselayer fabric, this shirt breathes and dries in a flash. With a tuckable length, soft self-fabric crewneck, offset shoulder seams to reduce chafing beneath pack straps, thumb loops for secure hand coverage and angled side seams for layering comfort. Made of 4.6-oz 94% polyester/6% spandex jersey, with 50+ UPF sun protection and Polygiene permanent odor control. Fabric is bluesign approved.