AfterPay Available - Offering stability and cushioning in all of the right places, the Nike Air Zoom Structure 25 was measured in the Nike Sports Research Lab to help assist alignment and steady runners prone to overpronation. An ultra plush Cushlon 3.0 midsole foam is paired with a rocker geometry for smooth heel-to-toe transitions. To enhance stability, Nike utilises a heel clip to lock your foot firmly in place.