The North Face Women's Ultra Cardiac 100% Mesh Synthetic sole Shaft measures approximately 2.75" from arch This lightweight yet protective trail runner delivers a smooth ride on any surface The Ultra Series provides critical impact and element protection while eliminating excess weight for unrivaled performance on any terrain Ultra Airmesh and FlashDry upper keeps you cool and dry Zonal protection only where you need it in the heel and toe Pebax heel CRADLE for proper heel positioning and support