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. Sustainably-sourced, biodegradable wool yarns provide light, breathable warmth with zero-waste construction Body-mapped knit construction for insanely fast dry times Ribbed cuffs, collar & bottom band for added comfort Highly reflective knit bands at biceps ¼ zip front makes for easy layering or added ventilation when you need it Style #: 1365625 100% Polyester Imported Wash inside out Machine wash cold on gentle cycle with like colors Do not bleach Reshape & dry flat Cool iron with cover if needed Do not dry clean