High temps can't hold you back when you're rocking a piece from the Echo Collection. Built with UPF sun protection AirVent moisture management ActiveFresh odor control technology and topped off with an anti-chafing flat-seam design the Echo Collection is the smarter way to tackle the heat without adding weight. From sun-scorched desert climbs to sweltering ultra runs the Echo is your perfect balance of tech-packed performance and ultralight protection. 100% polyester Functional Fly & Elastic Waistband Flat-Seam Construction Gusseted crotch