This is the Mares Concorde Full Foot Fins for Spearfishing or Freediving Features: Ideal choice for shallow to mid-depth diving New technopolymer blade and high-performance parabolic flexion Over molded foot pocket Tapered lateral rips for progressive blade flex New tip profile to prevent slipping from side to side while kicking Constructed from a lightweight Technopolymer material, the Mares Concorde fin is best suited for shallow to mid-depth diving