Mares Volo Power Open Heel FinsMares Volo Power Open Heel Fins Designed to be 30% more efficient than the traditional fins, this fin is a gigantic leap in the fin technology. Not only is it revolutionary but it is also covered by 8 different patents. It is a perect companion for those kinds of divers who wants the very best of power and efficiency in one fin. Commonly used for recreation, SCUBA, Snorkeling, Travel among many others, it is mostly used by customers who consider