The NEW BALANCE® 1210 Leadville was built for the ultra runner. With N2 cushioning, a REVlite midsole, and a Vibram® MT1210 outsole, it's engineered to keep runners comfortable, while they test the limits of what's possible.
http://www.runningwarehouse.com/descpageMRS-N1210M1.html http://www.runningwarehouse.com/descpageWRS-N1210W1.html The New Balance 1210 is a cushioned and supportive trail shoe intended for ultramarathon racing. Inspired by the legendary Leadville Trail 100, the 1210 features a traditional design and a medial post for all day runability. An accommodating fit allows for comfortable wear all day long, and a lightweight construction allows you to remain nimble whether at mile 5 or mile 95.