Havaianas Women's Top Flip Flop Polyvinyl Chloride Importado Rubber sole Heel measures approximately 1/2" US size stamp on shoe is based on Men's shoe size. This sizing comes directly from and should be the standard used on amazon: http://www.havaianasus.com/index.html#update_button Womens Sizing: BR 33/34 (US Womens 3 B), BR 35/36 (US Womens 5/6 B), BR 37/38 (US Womens 7/8 B), BR 39/40 (US Womens 9/10 B), BR 41/42 (US Womens 11/12 B) Mens Sizing: BR 39/40 (US Mens 7/8 D), BR 41/42 (US Mens 9 D), BR 43/44 (US Mens 10/11 D), BR 45/46 (US Mens 12/13 D) Note: Size stamp on shoe is incorrect. The tag will have the accurate US size conversion.