Mares Avanti Pure Open Heel FinsThe Avanti HC Pro diving fins have an elastic technopolymer blade and a highly resistant thermoplastic rubber foot pocket. The fitting is soft. The fin has an oversized central channel and is made of three materials for maximum thrust. Excellent performance, minimum effort and superior comfort! The Avanti Pure diving fins have a blade length ranging from 27 to 34. 5 cm depending on the size. The fins have an open foot pocket and are made of bi