Mizuno Women's Wave Ronin 4 Running Shoe 100% Synthetic and mesh Rubber sole Racing Shoe with Dynamotion Fit - Stress relief for the upper and lateral stress. Mizuno Wave, SmoothRide engineered, composite Parallel Wave for superior shock absorption and dispersion with great transition X-10 outsole is the most durable carbon rubber that allows for longer wear in high impact areas and supplements traction in the heel strike. Smooth Ride - engineering approach to minimize the rapid acceleration and deceleration of the foot during transition, creating the smoothest ride possible Upper - Airmesh upper provides the utmost in breathability and comfort of the upper. AP Midsole is a lightweight, reponsive, yet durable cushioning copolymer. Weight: 6.0 oz G3 Sole- Outsole provides superior grip with less weight. G3-Dr provides added durability in key contact points