The Coolmax Liner is a fine knit liner sock that improves moisture management and blister protection. Made with an exceptional fit, this liner has a silky, next to skin comfort. When worn under a pair of quaility wool socks, the Coolmax liners will help keep your feet drier and more comfortable. Sold in packs of 2. 57% Coolmax, 20% Nylon, 19% Polypropylene, 4% Lycra.