The SCUBAPRO Rental Full Foot Fin Features: - Durable Monprene construction will last a lifetime of active diving. - Patented split fin propeller technology produces lots of propulsion with minimal effort. - Drag-reducing vents where foot pocket and blade meet radically decrease drag on both up and down strokes. - Foot pocket´s extended soleplate allows you to maximize the amount of energy you expend on each kick without wasting energy.