The GT 2120 from Asics features Impact Guidance System linked componentry that enhances the foots natural gait from heel strike to toe-off. Solyte Midsole Material lighter than Asics standard EVA and SpEVA combined with improved cushioning and durability. Space Trusstic System an advanced system that creates a pocket between the Trusstic System device and the midsole allowing for greater midsole deformation and more efficient foot function. DuoMax Support System helps ensure that the shoe maintains proper support for the foot during the critical transition from heel strike to toe-off. GEL Cushioning Systems attenuates shock during impact phase and toe-off phases.