Great fins for warm water snorkeling or Scuba! Oceanic"s V-Flex strap fins that require NO boots, Sturdy side rails to channel the water & pre-bent design for a natural kick, Soft foot pocket with easy to adjust strap, | Size Chart XS/MD - Mens 6-9 & Ladies 7-9.5 or MD/XL - Mens 9-11 & Ladies 9.5-12