The Mares Plana Avanti Tre features a soft anatomical orthopedic foot pocket, and mid-sized blade with three channels for optimal movement of water during the kicking cycle. Mares Design inspired by marine mammals. Channel thrust technology maximizes the channeling of water and moves a much greater amount of water compared to other fins of the same size. The result is greater thrusting power with the same amount of effort, superior comfort and performance. Tre is perfect for travel to warm water locations. Upper and lower stabilizers help transfer energy from the foot pocket to the blade. Fin gives an easy kick for extended snorkeling time. Super-channel is designed for the diver who wants the perfect blend of power and efficiency in one fin. The blade design with a large central Super-channel and two traditional lateral channels provide excellent thrust while maintaining hi-efficiency and minimizing leg fatigue. Fins are manufactured from Tecralene, thermoplastic rubber and have an easy grip heel pull tab for donning and doffing of fins. Open toe design for added comfort. Size 8/9 (42/43) fin blade length is 14.2" (36cm), weights 1.3 lbs. (600 g) and has a blade thrust area of 105.4 cubic inches (690 cubic centimeters). Available in multiple sizes and colors.