UNIQUE BLADE DESIGN: Ellipsoidal blade generates correct propulsion in all four swim strokes – even breaststroke ASYMMETRICAL FINS: Blade shape promotes a natural kick cycle EFFECTIVE TRAINING: Increases leg strength, foot speed and ankle flexibility –Great for training the individual medley event; Safely build a powerful breaststroke kick ERGONOMIC FOOT POCKET: Comfortably places feet in an ideal swimming position ADJUSTABLE HEEL STRAPS: Create a customized fit that secures fin and allows feet to flex more naturally