Innovative closed-shoe free diving fins; Comfortable full foot pocket; Fins can be worn barefoot or using neoprene socks; Interchangeable blade made from special techno polymer that maximizes flexibility and reactivity; 22-degree angle between blade and foot optimizes thrust power with less effort; Hard thermoplastic rubber foot pocket with dual material density; The shoe, designed in 2 materials, guarantees optimal foot comfort without losing any effectiveness in kicking; Ideal for spearfishing and during intensive kicking training for dynamic freediving