Train more effectively with the Optimus Training Fins. The notched fin distributes force more evenly during a kicking cycle, allows for the natural uninterrupted flow of a flutter kick. The short blade creates training overload without slowing down the stroke tempo, even at racing speed. The rigid side rails allows for vertical stabilization. The foot pocket is designed with softer rubber for greater comfort and less chafing during maximum workload and extended workouts. The slip resistant treat on the heel keep feet stable on the bottom and sides of the pool.