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Ideal for a day spent linking sunny cirques with shady groves, this formfitting, high-performance baselayer features strategically placed open-mesh knit patterns that help release heat and invite airflow, keeping you warm, dry and comfortable when you’re moving fast. Tube construction eliminates side seams and the chafing that goes with them; Biostretch 3 fabric is silky-smooth next to the skin and glides easily beneath layers. With a deep zip for easy climate control, Y-Joint™ sleeves that reduce friction and increase mobility, and a tuckable length. Made from 5.5-oz 95% polyester (73% recycled) and 5% spandex, with 50+ UPF sun protection. Recyclable through the Common Threads Recycling Program.