adidas will try to penetrate the marathon scene once again with this Adizero Sub2. This was worn by former record holder, Wilson Kipsang at last Sunday's Tokyo Marathon. A single-layer mesh upper was used to keep it light as possible with full-length Boost foam catered to a marathon runner. Boost is known to give excellent energy return and I guess they tweaked it a little bit to cater to a runner's need especially for long-distance running. Should this perform well, I am pretty sure that the adidas Adizero Sub2 will be an option for runners.