The OS1st TA4 Thin Air Performance Socksfeature the thinnest upper foot profile ever made! With built in comfort, durability, and blister protection, the Thin Skin construction helps to maximize airflow while providing padding and lift for your arch helping to keep your feet cool. With 4 Zones of Compression Technology, the Thin Air Performance Socks provide light to moderate graduated compression for non-binding comfort and circulation. These ultra light socks are a must have for every athlete!