Altra's newest shoe, the Mont Blanc, is explicitly designed for ultra runners. The upper is pared to the bare minimum for an ultralight and highly breathable shoe. The EgoMax midsole has a 30mm stack, and it's plush and springy even after 100 miles. And the Litebase outsole is Vibram's lightest material yet while maintaining all the durability and traction you would expect from Vibram. When you need a race day performer, look no further.