Kiefer Silicone Training Swim Fins Shorter blade improves kicking mechanics and efficiency Color coded sizes for quick selection and sorting Flexible foot pocket and closed ankle provides extra support Made from top quality silicone rubber for comfort and added durability.Very comfortable fit Note that fins will be stamped and labeled with the mens size 5-6, which is the equivalent of a women's 7-8 and Very comfortable fit ; if you are at the larger end of the size range, fit will be snug