Mizuno Men's Wave Rider 14 Running Shoe 100% Synthetic Rubber sole Dynamotion Fit is design technology that relieves the stress the foot naturally places on footwear, eliminating distortion for the perfect fit Mizuno Intercool is a full-length midsole ventilation system that reduces heat and humidity build-up inside the shoe SmoothRide - Engineering approach to minimize the rapid acceleration and deceleration of the foot during transition, creating the smoothest ride possible