Zoot Women's Carlsbad Running Shoe 100% Nylon Mesh Imported Rubber sole Shaft measures approximately Low-Top" from arch BareFit internal liner with open mesh provides exceptional fit and breathabilit Z-Bound Insole give the shoes added cushioning and durability Internal support cage provides midfoot support. Z-Bound+ provides a soft responsive feel under your foot CarbonSpan+ provides mid-foot support and dynamic toe-off