J Heel. Converts a regular track shoe into a multi-purpose track shoe for jumpers and throwers. Use on plant heel for javelin or plant heel on "J" approach to high jump. This versatile heel can be used by a number of athletes for different events or by one athlete for multi-events. One size fits all - adjustable, can be used on right or left heel. The JHEEL is legal in all states for competition as per NFSHSA rule 7-2-8.