Used Mares Avanti Quattro Plus Open Heel Bungee Strap FinThe Avanti Quattro + diving fins feature a blade length ranging from 37 to 39 cm, depending on the size. These fins have an open foot pocket and a unique four ribs design that allows for arching during the fin stroke. This design helps channel water in the opposite direction of motion, reducing pressure loss at the side edges of the fin and maximizing propulsive thrust. The Avanti Quattro+ fins are made with a new composition of material that enhances