The Outdoor Research Echo Short Sleeve Tee is perfect for when high-exertion workouts and high temps don’t always play nice together. Built with UPF sun protection, AirVent 100% polyester 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. From sun-scorched desert climbs to sweltering ultra runs, the Echo is your perfect balance of tech-packed performance and ultralight protection.