The exciting Avanti Pure X 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 (TPR) 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. Features: Quick Adjusting System (Patent Pending): Two options to adjust the length of the bungee strap for the perfect fit and best comfort during a dive Soft and comfortable foot pocket Ergonomic heel pad minimizes pressure on the Achille&&';;s tendon Can be used barefoot or with Mares Pure booties Bungee strap puller with loop, makes donning and doffing easier and faster Dual-material fin with an exceptionally soft, comfortable open heel Soft blade with enhanced "Channel Thrust" effect to optimize water flow and lower fatigue during use