Reebok Footwear Men's SmoothFlex Ride 3.0 EX Running Shoe 100% synthetic Rubber sole SmoothFlex technology combines traditional cushioning with RealFlex-inspired outsole nodes to promote natural motion Upper overlays integrated into the lacing system CRTek high-abrasion rubber in high-wear areas Blending natural motion with traditional cushioning and design, this is a fleet-footed hybrid.