Focused on speed and performance, these shoes fall in the range of New Balance shoes that are designed for the very quickest; that means sub three-hour marathon runners and five-minute milers. Mind you, maybe the reason you've yet to dip under those times is because you never had these.Abzorb is the midsole foam that provides the shoe with comfort and performance, as well as isoprene rubber that enhances the ride. Add to this REVLite midsole foam and it becomes clear why these are so quick. This is an innovative foam compound that offers the same durability and responsiveness of foams that a third heavier. There is a lightweight ride with no sacrifice on underfoot cushioning or stability.As well as no-sew material application, the shoe also boasts a full length Abzorb strobel board and a blown rubber outsole.