{"product_id":"deep-apnea-quadraxial-100cm-carbon-fiber-fin-blades","title":"Deep Apnea Quadraxial 100cm Carbon Fiber Fin Blades","description":"\u003ch6\u003eOverview\u003c\/h6\u003e\u003cp\u003eDeep Apnea Quadraxial 100cm Carbon Fiber Fin Blades are designed for freediving and spearfishing, combining aerospace-grade carbon fiber with Variable Parabolic Stiffness (VPS) technology. Their multilayer construction supports responsive propulsion during surface swimming, underwater maneuvering, and ascents while minimizing unnecessary blade vibration.\u003c\/p\u003e\u003ch6\u003eBlade construction and performance\u003c\/h6\u003e\u003cp\u003eThe Quadraxial structure positions carbon fibers in four directions: 0°, +60°, 90°, and -60°. This multidirectional arrangement increases resistance to twisting forces, helping the blade maintain stability as it flexes under load. The VPS laminate controls how the blade bends and rebounds throughout each kick, allowing energy to transfer through the blade during propulsion. This response also supports smaller, controlled movements when approaching fish underwater.\u003c\/p\u003e\u003ch6\u003eStiffness selection\u003c\/h6\u003e\u003cp\u003eBlade stiffness should be selected according to the diver's body weight and leg strength. Properly matched blades flex under kicking pressure and recover during the return stroke. Excessively stiff blades can increase leg fatigue, while blades that are too flexible may provide insufficient resistance for efficient propulsion.\u003c\/p\u003e\u003ch6\u003eFoot pocket compatibility and installation\u003c\/h6\u003e\u003cp\u003eChoose a Neritic, Neptonics, or Cressi foot pocket and the required Foot Pocket Size. Select No Foot Pocket for blades without foot pockets. Compatible foot pockets and the correct mounting configuration are required to use the blades as complete diving fins. The mounting-hole configuration must match the intended foot pocket before installation. Deep Apnea recommends mechanically fastened foot pockets with full-length tendons and maintains a list of approved models for warranty eligibility. 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