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XXS, Purple: Shoe Size 1-2 M, Yellow: Shoe Size 6-7 TYR's versatile SplitFinTM Training Fin looks different because it is different. Unlike conventional fins that force the foot to push water in a flat plane, much like an old paddlewheel, the unique split blades slice through the water with two winged surfaces, creating lift and forward propulsion much like a propeller. SplitFinTM operates more efficiently than 'paddle' bladed fins by mimicking a user's natural kicking cadence. This ensures a more even distribution of resistance during the upswing and down thrust motions of the kicking cycle, working both muscle groups equally to help build leg strength and power output. The SplitFinTM functions optimally with a tighter, higher frequency kick for maximum performance power and speed training benefit. This type of kick simulates the natural 'turnover' rate an athlete can only achieve at race pace. The unique, flexible split blade allows sustained intense training over the course of your workout and helps reduce the ankle strain, fatigue and cramping often associated with the use of conventional 'paddle' fins.