NEW BALANCE. M840SB3. M840SB3. SILVER BLUE.Train and compete hard in a pair of New Balance 840 running shoes. These shoes are made to deliver all of the support and protection you need as a flat-footed runner. The shoes are designed to meet the unique biomechanics of your body and work with them not against them to prevent injuries and fatigue that can plague those with flat feet. Made with mesh and synthetic the 840 includes a padded heel collar that offers additional comfort. Moreover a removable insole provides even more cushioning. Even the outsoles of this shoe are made for serious mileage featuring enhanced rubber compounds in the areas that typically receive the greatest wear.