ALTRA Women’s Superior 4.5 Raspberry Size 8.5 Gently Used - Like New There are many words to describe the speedy Superior 4.5. The Quantic midsole offers a lightweight yet responsive ride for high-speed trail days. TheMaxTrac outsole and multi-directional lug pattern brings grippy traction to any terrain. The improved upper brings better breathability and durability. And finally, the removable StoneGuard offers lightweight rock protection for when the trails get extra rugged.