Reebok Zpump, Women&rsquo;s Flatform Pumps Synthetic Rubber sole PowerFrame Fusion Sleeve upper for a lightweight, seamless and secure feel Pump technology, an air-filled cage, pumps up and adapts to every foot and workout for a locked-in custom fit Moulded 5.0 mm sockliner offers superior cushioning Gas fueled carbonated foam midsole for lighter weight cushion and response Reinforced midfoot platform for a solid and responsive foundation