New Balance Men's MR773 N-ergy Running Shoe 100% Synthetic and mesh Rubber sole ACTEVA LITE premium lightweight midsole provides optimal resistance to compression set - 24% lighter than standard foam N-ERGY provides NB's most advanced shock absorption and cushioning N-Durance rubber compound for maximum outsole durability Seamless Phantom Liner reduces the weight of the shoe plus enhances the comfort and fit Shoe Weight: 313 grams (11.1 oz)