Sock liners are your first line of defense against moisture and blisters on your feet. Used in conjunction with a thicker sock, sock liners feature optimum moisture-wicking capabilities and further protect your feet from irritation. While most sock liners have the ability to help keep your feet warm or cool by adding an extra layer and wicking away moisture to the outer layer (depending on the fabric), some are more breathable and quick-drying than others. The thinner, more nonabsorbent the sock liner is the better! Protect your feet and try them today!