Avanti Quattro Power The ultimate Channel Thrust fin for speed, power and fun in the water FEATURES Ideal for both scuba and apnea Channel Thrust technology for optimum performance Rubberized side ribs Sizes: 6.5/7.5 (40 EU) 8/9 (42 EU) 9.5/10.5 (44 EU) The best all-around full foot fin for diving. The Avanti Quattro Power is perfect for warm water divers, snorkelers and free divers that want ultimate power, comfort and speed. The choice of demanding scuba and free divers. Comfort combined with extraordinary performance.