Women's Hoka Challenger 8 All Terrain Running ShoeDesign & Build Midsole Cushion PlatformThe Challenger 8 uses a compression molded EVA foam midsole, with more foam underfoot than the previous version. The heel to toe drop is 8 mm in the womens version. Stack heights are around 39 mm in the heel ~32 mm in the forefoot for women. Upper & FitThe upper is engineered mesh made from 100% rPET (recycled PET) materials. There's a plush collar, a durable reinforced toe cap for protection, and extended heel