This open-heel fin is a serious kicker that generates a lot of power
Cressi’s Reaction adjustable fin has a long and relatively flexible blade that’s made from a new-generation technical polypropylene. This lightweight composite makes for a responsive fin throughout each phase of the kicking cycle. In ScubaLab tests, the Reaction generated above-average thrust, and the long blade proved to be great for sculling, and effective when used with flutter and dolphin kicks. Delivering a balanced mix of feedback and flexibility, the fin’s beefy side rails and smooth surface from foot pocket to blade tip make for less turbulence and more stability when moving through the water. The Bottom Line: The Reaction is a solid fin with a substantial blade that can produce some serious propulsion.nd Bare’s X-C-S-2 Tech Dry ranks among the best of them.