This is the Tilos Voyage Full Foot Snorkeling Fins with Soft TPR Foot Pocket Fin Features: Drag reducing vents as well as TPR full foot pocket design TPR strap for excellent adjustability Soft TPR foot pocket reduces strain on user&';s feet Available in Black, Blue and Yellow MD (Mens 6-7, Womens 7-8)M/L (Mens 7.5-8, Womens 8.5-9)LG (Mens 8.5-9, Womens 9.5-10)XL (Mens 10.5-11, Womens 11.5-12.5) The parachute center thrusts the diver forward with each kick while dampening water resistance. The Voyage will keep your mind on the voyage rather than on your feet.