- The fourth version of the GT-1000 is updated with a fresh new upper built with engineered mesh and minimal yet supportive overlay reinforcements. The bouncy SpEVA Midsole has been engineered to be provide a smooth and cushioned ride, while the DuoMax Support System and Guidance Trusstic System provide excellent support for mild to moderate overpronators. APMA Seal of Acceptance. Impact Guidance System (I.G.S.). Rearfoot and Forefoot GEL Cushioning System. AHARDuoMax Support System
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