0k, basicly they are a type of rubber that is an 8th of an inch thick i think. or a 16th. well anyways, they return more force back than any other insole and can increase ur vertical jump by up to 2-3 inches, they can make u run faster and protect u from ankle and foot injury.

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Age:15 Height: 5' 10" or so. Running Vertical Jump: about 33-35 inches
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