Cressi Gara 2000 HF Fins use a patented process to merge 3 different materials for the optimal combination of light weight, flexibility, hardness, and resistance. Flexible elastomer thermo rubber adds comfort to areas that require flexibility and elasticity, including foot pocket's forefoot, the sole's interior and the instep area. Compact elastomer on the longitudinal ribs, foot pocket's sole and foot's head strap delivers slip resistance. This material links the energy transmission critical point (the instep) with the nerves in a single piece, eliminating the usual energy loss through extremely flexible components of the foot pocket that produce a heavy and slow flutter that fatigues the instep. High-modulus propylene on the Gara 2000 HF fins' blade and internal sandwich sole area promotes rapid energy transmission and superior structural rigidity. Highly reactive properties facilitate an effective and agile flutter with superior resistance to breaks. Combines light weight, flexibility, hardness, and resistance Flexible elastomer thermo rubber adds comfort Compact elastomer delivers slip resistance High-modulus propylene promotes rapid energy transmission