THE SLIPPY"Put on Your Wetsuit with Ease" Ripstop Nylon Wetsuit Bootie (Pair) MEDIUM: Men's U.S. shoe size 3.5-6.5, Women's U.S. shoe size 5-8 LARGE: Men's U.S. shoe size 7-14 , Women's U.S. shoe size 8.5-15.5