The Mares Avanti Quattro+ build upon the popularity, reliability and strength of the traditional Quattro model with a new blend of high flex materials for increased efficiency. A The Quattro+ uses the same four channel blade design to provide great thrust and efficiency but the fins are made with new Mares Hi-Flex materials to give the blade the extra performance edge over the previous model. The buckle system has also been replaced with a bungee strap for easy donning and removal of the strap and fins from the foot. Features: Versatile and Ideal in All Diving Conditions Channel Thrust Technology system for optimal water channeling Exceed the Established Performance of Traditional Model Greater Responsiveness and Thrusting Power Maintaining optimal thrust throughout every phase of the finning stroke minimizes fatigue Quick release, quick-adjust buckle makes adjusting a snap Soft anatomical foot pocket, with ribbed insole for an improved fit and a dramatically more efficient fin stroke ABS (Adjustable Binding System) Fin Buckles.