Thirteen thousand feet is awfully high. After reaching the summit, brutal winds threaten to chill your core. Good thing you're wearing the Outdoor Research Men's Radiant LT Zip Top to trap heat under your outerwear. This 1/4-zip pullover sweater uses Radiant LT fleece for toasty warmth, and it breathes well and wicks sweat when you engage in heavy exercise. The Polygiene treatment resists built-up odor for a fresher feel when your high-altitude adventure is finished.