The Mizuno Speed Trainer 4 is built with a Dynamic Synthetic Leather® upper for superior feel, breathability and comfort. Parallel Wave™ Technology adds extra cushioning and stability to the midsole. A full-length EVA footbed provides incredible shock absorption with an overall cushioned feel. The Kube outsole adds comfort and flexibility thanks to responsive ProFlex™ multi-zone flex points. Wt. 12.6 oz.