What are the 'pump up tounges' for in tennis shoes?

the Pump system offers a custom fit while protecting the heel, the ankle and the collar area of the foot. Different models of the shoe had different Pump systems, which was integrated into the tongue of the shoe. The lining of the shoe contains a bladder which houses the air chambers which inflate making them like air bags for the feet. With all that pumping you’ll also need a way to release the pressure so there’s a little valve to let air out of the chambers!



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