Mares Razor Pro The innovative Razor fins deliver the best performance among all technopolymer fins currently on the market. They are a benchmark for the most demanding freedivers and spearfishermen SIZE USA size worn WITHOUT a 3 mm Sock USA size worn WITH a 3 mm Sock 39/40 8.5/9.5 7/8 41/42 10/11 8.5/9.5 43/44 11/12 10/11 45/46 13/14 12/13 47/48 15/16 13/14