The air-filled Pump technology of Reebok ZPump Fusion 2.0 running shoes inflates inward for locking in the perfect, customized fit. Test out the perfect number of pump to achieve a custom fit for your feet. Slip them into the cushioned underfoot feet for a soft and responsive ride. Check out the new fashion-forward style update. Upper: Seamless PowerFrame Fusion Sleeve for compressive, Pump-fused support. Low-cut design provides outstanding ankle mobility and speedy stride transitions. Flat laces reduce irritation. 3M reflective eyelets and heel pull offers enhanced visibility.Midsole: Reinforced midfoot tuck board offers striding stability and torsional rigidity. Gas-fueled carbonated foam provides a soft, lighter-weight responsive ride.Outsole: Minimal CRtek high abrasion rubber provides durable traction at key-wear areas.