With an updated midsole platform, the Mizuno Wave Rider 20 is back and more comfortable than ever before. Breathable Triple Zone engineered mesh upper for a comfortable fit that move with you. Neutral Wave Plate for responsive cushioning with every step. U4icX heel wedge for plush comfort. 12mm offset. Blown rubber forefoot for durable traction on any surface. Wt. 8.3 oz.