Product Description This Bunga Single Density Healcup is a single density silcone based gel. Sold in pairs. Fitting and Sizing Proper size, select product size according to your shoe size. U.S. Men’s U.S. Women’s Euro Men’s Euro Women’s Small 7 5-7 37.5 35-37.5 Medium 8-9 8-9 41-43 38.5-40 Large 10-11 10-11 44 42-43