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The Air Zoom Structure 21 features updates that make it stronger, lighter and more supportive than ever before. With a revamped engineered mesh upper, the shoe brings you lightweight breathability and greater durability.
A full inner mesh bootie wraps the foot to further the breathability while creating a comfortable, sock-like fit. Featuring a dual-density midsole and Dynamic Support system in the midfoot, the Structure 21 cushions each stride and provides secure, locked-down support.