Light. Fast. Grip. Fast. Responsive. Fast. The fast Superior 4.5 can be described in many words. The Quantic midsole offers a lightweight yet responsive feel for extra feel for extra fast days on the trail. The MaxTrac outsole and the multidirectional sole profile provide grippy traction no matter what the terrain. The improved upper delivers better breathability and durability. durability. In addition, the lightweight removable StoneGuard provides a stone protection insert when the trails get particularly rough.