Model Name: Challenger Mid Gore-Tex Model Number: 1106521-BLK Material: Leather Color: Black Condition: New with box Width: Medium (D, M) HOKA ONE ONE has engineered a unique performance midsole geometry that features a higher volume, softer density, and greater rebounding foam than standard running shoes. Along with maximal cushioning, this provides runners of all types with an energizing, stable ride. HOKA ONE ONE understood from the beginning that natural foot motion was extremely important for uniformity of stride. HOKA ONE ONE incorporated minimum drop geometry along with a rolling rocker design to promote consistent rhythm in the runner's foot strike.