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The Aetrex™ X521 High Performance Runner is made from technologically advanced leathers, polyurethanes, and moisture transferring polyesters to keep the foot in a healthy, cool environment. The biomechanically engineered, multi-density midsole features a Carboplast foot bridge for motion control and stability. Special features include an Airlex™ 2 way open air sandwich mesh upper and a high, wide toe box for forefoot comfort.
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