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Cressi Sub Reaction Fins Cressi-sub has spent hundreds of hours testing (both machine and in water) and evaluating the various aspects of underwater propulsion. The result of this research is our newest fin - Reaction. Reaction is an ultra lightweight adjustable heel strap fin that is designed to react to the water forces applied to the blade. The blade is made of a unique material that is very resilient. As the diver applies additional force to the blade, the blade will react and adjust. As the diver decreases the forward thrust effort, the resilient blade material will react by thrusting the diver forward.
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