Havaianas Women's Fit 100% Synthetic Synthetic sole Heel measures approximately 0.75 inches" Brazil size 35/36 fits US Women's size 5/6, Brazil size 37/38 fits US Women's size 7/8, Brazil size 39/40 fits US Women's 9/10, Brazil size 41/42 fits US Women's 11/12. US size stamp on shoe is based on Men's shoe size