Mares Avanti Quattro+ Open Heel FinMares Avanti Quattro+ Open Heel Fin The mares avanti quattro plus fin is the new and restyled version of the legendary avanti quattro fin. increased efficiency with the use of new hi flex material four channels for four times the thrusting power bungee strap this dive fin exceeds the established performance of the traditional model thanks to the use of new materials that optimize efficiency. Greater responsiveness and thrusting power now have an even