Reebok RealFlex Speed 3.0 Mens Running Shoe Synthetic Synthetic and mesh upper for comfort, fit and breathability Low-cut design for added mobility with removable sockliner for cushioning that accommodates orthotics RealFlex outsole is engineered with individual, multi-directional nodes so your feet can flex naturally as you run, jump and stretch Minimalist foldover tongue and modern lightweight styling Carbon rubber heel strike for durable traction