The exciting Avanti Pure offers a comfortable foot pocket - it can even be used barefoot - with an ergonomic heel pad for reduced pressure on the heel and special bungee strap for perfect positioning and ease of use. With added channel thrust power. A two-material open heel design made from thermoplastic Rubber (TPU) and Tecralene. Soft and comfortable foot pocket and ergonomic heel pad (patent pending) minimizes pressure on the Achilles' tendon. Special bungee strap for maximum comfort during use, when donning and doffing. Strap has bungee guides, so the strap is always placed in the right position. The fin blade is 12.6" (32cm) in length (size M/L), has an 85.2" square inch (550sq. cm) blade thrust area (size M/L), weigh 22.4 oz. (635g) and is available in multiple sizes.