The Men’s SMARTWOOL PHD RUN ULTRA LIGHT Print Micro sock mixes style and comfort. The cool print design gives it a stylish look while Indestrucawool technology adds durability. The mesh ventilation provides breathability for those long runs. The Shred Shield technology on the toes provides cushioning to protect from damaging the fabric. Merino Wool is a lightweight fabric that absorbs sweat and keeps you fresh. The Achilles tab on the heel makes sure the sock stay on snug.