Mizuno Women's Wave Rider 13 Running Shoe 100% Synthetic and airmesh Rubber sole SmoothRide Engineered to minimize the rapid acceleration and deceleration of the foot during transition, creating the smoothest ride possible Composite Parallel Wave for superior shock absorption and dispersion with a great transition to boot Solid rubber forefoot outsole design for cushioning, flexibility, and durability AP midsole functions as a lightweight, responsive, yet durable cushioning copolymer Gender Engineering - Te latest engineering philosophy to maximize performance by tailoring footwear to the separate needs of men and women