Reebok Zigkick Sierra Mens Running Shoe mesh Layered mesh and tech upper for a fresh look with a fantastic feel and fit. Low-cut design for freedom of motion and quicker running stride transitions. ZigKick platform midsole and decoupled heel for handling heelstrike to propel you. Minimal CRTek rubber in key areas for durable traction where you need it. TPU propulsion plate for channeling impact energy into faster foot transitions.