The Men’s SMARTWOOL PHD RUN LIGHT Elite Pattern Micro socks are built to perform. The cool pattern design gives them a stylish look while Indestrucawool technology adds durability. Merino wool is a versatile and breathable fabric that stays dry and will keep you fresh. The mesh ventilation provides additional breathability on hot days. The Shred Shield technology on the toes provides cushioning to protect from damaging the fabric. The Achilles tab on the heel prevents the socks from slipping off.