Like the standard Altra Timp 5, this BOA edition offers the same balanced cushioning that's protective, comfortable, and steady. This blend allows it to excel for both standard daily training and long runs verging into 50K ultra territory. Both the Timp 5 and Timp 5 BOA utilize Altra's EGO MAX foam. This updated material offers a lighter and more cushioned ride to shield your legs from rugged terrain over diverse trails.