Altra Women's Superior 1.5 Trail Running Shoe 100% Synthetic Imported Synthetic sole Shaft measures approximately 2.75" from arch Minimal trail runner featuring lace keeper overlay with logo and honeycomb design ZeroDrop platform with 0mm heel-to-toe drop Female-Specific Design GaiterTrap Technology Natural Ride System Removable StoneGuard rock protection system Dual-layer EVA midsole with A-Bound