Trusstic – an advanced system that creates a pocket between the Trusstic system and the midsole, allowing for greater midsole deformation and more efficient function......... SpEVA midsole – a supreme midsole material that improves bounce-back characteristics and decreases midsole breakdown.............. Visible Rearfoot GEL – a special kind of silicone that enables optimal shock absorption.......... PU 3 Plate System – unique to Asics and gives the boot greater flexibility than normal stud plates...........