PRODUCT FEATURES: Maximize Your Swing Power: Device helps to isolate the muscles necessary for the proper stance and balance and use their lower body for maximizing the power of their batting swing Ideal for young players to develop their skills as well as for experienced players who want to re-establish the fundamentals For use on the field, in the batting cage, or the backyard ADDITIONAL DETAILS: Pairs well with the Rotor System USA PBS Foot Extension to create a complete training system Manufacturer's Warranty: Replacement only on new, unused, and unaltered products