Ryan hall is sponsored by Asics, a Japanese sports shoes maker. The shoes color are black and white.
The black and white Asics were custom made for Ryan Hall, so you wont see them in the running stores.
According to running competitor : His feet were measured from every angle, using cutting-edge technology, and his legs were measured for strength and flexibility in relation to other marathoners. Run testing on an indoor/outdoor track helped determine his ground impact, force and reaction time.
After 2 days of testing, researchers had the information needed to create a pair of shoes uniquely designed for Hall’s specific running mechanics. Read more @ running competitor