These shoe inserts are made with all natural alpaca fibers. They measure about 1/4" thick and are soft, not scratchy, and will wick away moisture.
Medium is for shoe size 5-6-7 (up to Men’s 9)
Large shoe size 8-9-10 (up to Men’s 11)
Extra Large shoe size 11-12-13-14 (up to Men’s 14)