Designed for running ultra-distances on uneven trails, the TRAILFLY ULTRA SOCK delivers comfort and protection in the areas you need it most. Targeted cushioning underfoot provides protection on unpredictable terrain and a snug fit ensures the sock is so comfortable you’ll feel like you can run forever. The highly breathable fabric delivers natural temperature regulation and is constructed from a blend of yarns featuring over 66% recycled material and 16% natural Merino Wool. Vented panels around the midfoot provide extra comfort, while the moisture-wicking properties of the material ensure sweat is drawn away from the foot, keeping it dry.