ALTRA SUPERIOR 4.5 SHOE - WOMEN'SLightweight. Fast. Grippy. Fast. Responsive. Fast. There are many words to describe the speedy Superior 4.5. The Quantic(TM) midsole offers a lightweight yet responsive ride for high-speed trail days. TheMaxTrac(TM) 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(TM) offers lightweight rock protection for when the trails get extra rugged.FEATURESFOOTSHAPEOur signature FootShape comfort gives your feet more space to sit naturally and is designed to address biological differences in men's and women's feet.BALANCED CUSHIONINGOur Balanced Cushioning platform positions your heel and forefoot at an equal distance from the ground, encouraging better alignment, better form, and a low impact landing.QUANTICOur Quantic foam offers a luxurious and lightweight cushioned midsole, designed for miles and miles of comfort.MAXTRAC Our grippy MaxTrac outsole provides the perfect combination of grip, traction, and durability on all types of terrain.TRAILCLAWThese canted lugs on the outsole are strategically placed beneath the metatarsals to provide added traction underfoot.GAITERTRAPThis hook-and-loop tab allows our strapless gaiter to easily attach to the shoe, adding protection against rocks and debris.INNERFLEXThese grid-like grooves in the midsole are designed to provide flexibility and movement.TECH SPECSWeight: 7.0 oz / 198 gInsole: 6 mm Contour Footbed with removable StoneGuard(TM)Midsole: Quantic(TM) with InnerFlex(TM)Outsole: MaxTrac(TM) Rubber with TrailClaw(TM)Cushion: LowStack Height: 21 mmUpper: Seamless wrap-around engineered knit