Deep Apnea Unlimited 70cm Carbon Fiber Fin Blades

Overview

Deep Apnea Unlimited 70cm Carbon Fiber Fin Blades are designed for freediving and spearfishing and are intended to be assembled with compatible foot pockets. Their multilayer Variable Parabolic Stiffness construction and quadraxial carbon-fiber structure manage flex, recovery, and torsional response through the kick cycle.

Blade response

The multilayer carbon layup creates a Variable Parabolic Stiffness profile so the blade can flex progressively and recover as the kick changes direction. Carbon fibers positioned at 0°, +60°, 90°, and -60° distribute loads in multiple directions, helping the blade resist twisting while retaining the longitudinal flex required for finning. The construction is also designed to reduce unwanted vibration during controlled kicks.

Choosing stiffness

Stiffness selection should account for body mass and leg strength rather than being treated as a universal rating. The blade needs to flex substantially during the kick and recover as the leg reverses direction; excessive stiffness can increase leg resistance and fatigue, while insufficient stiffness can reduce the amount of water moved during each stroke.

Foot-pocket setup

Choose 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 pattern must correspond to the selected foot-pocket system. If drilling is required, mounting holes larger than 6 mm or 1/4 in, or holes placed through the bend area of the blade, fall outside the manufacturer's warranty conditions. Warranty coverage also depends on installation in an approved foot-pocket system or confirmation that an alternative system is acceptable.