The Third Version Of The Gt-1000™ Elevates The Series To A New Echelon Of Technical Performance, Now Proudly Designed With Impact Guidance System (I.G.S®). The Bouncy Speva® Midsole Has Been Reengineered To Be More Protective And Cushioned, While The Duomax® Support System And Guidance Trusstic™ Provide Excellent Support For Mild To Moderate Overpronators.