Newly ventilated and protective upper design. Engineered mesh with a breathable underlayer mesh fabric. Protective heel guards. Anatomically designed Pressure Free Tongue contours the top of the ankle. Progressive New Logo design on the quarter panel. Full-length QuickFoam and QuickSpring+ technology. High Abrasion Rubber Tech provides grip. QuickFoam Insole Sockliner comprised of an EVA rubber blend. QuickFlex 4 Foot Engineering.