Reebok Men's SmoothFlex Ride 3.0 Running Shoe 100% synthetic Rubber sole Designed for neutral- to under-pronation SubLite midsole foam SmoothFlex technology combines traditional full-heel cushioning with RealFlex-inspired outsole nodes CRTek high-abrasion rubber in high-wear areas Combining the best of two worlds, this cushioned, flexible runner inspires natural motion without giving up protection.