The Men’s SMARTWOOL PhD RUN LIGHT Elite Print Crew Sock is a high-performance sock made for running. Indestrucawool technology provides added durability and comfort. The mesh ventilation provides breathability, so you stay fresh on long runs. The light elite cushioning under the entire foot offers a cushioned sole without adding bulk. Merino Wool is a lightweight fabric that absorbs sweat and brings it to the surface, so your feet stay cool. The virtually seamless toe uses minimal stitching to avoid friction.