Newton Running;

The Newton Running Sir Isaac Features Metatarsal Stretch Panels For Foot Adjustment, Second Generation Action/reactiontm Technology In The Midfoot And Heel, Mid-foot Support Chassis For Added Stability, Beveled Heel And Toe, Met-flex Enhanced Midfoot Flexibility, Enhanced Sock-liner That Increases Energy Return And Protection, Accommodates Most Orthotics, Durable High-traction Actuator Lugs, Increased Toe Spring, Pronounced Heel Rocker And High-wear Carbon Rubber With Traction Tread.