Product DNA What's It Do? Layering up for winter runs usually means peeling off gear mile after mile. We solved that problem by reinventing this knit at the microscopic level so it not only keeps you warm, but stays light and breathable all run long. The Fundamentals Fitted: Next-to-skin without the squeeze High performance yarns provide breathable warmth without the weight Body-mapped knit construction for insanely fast dry times Ribbed cuffs, collar & bottom hem for added comfort Highly reflective knit bands at biceps & patch logo on left sleeve Generous ½ zip front makes for easy layering Imported