La Sportiva Karakorum Mountaineering Boot - Women's Leather 2.8mm Idro-Perwanger leather uppers withstand years of abuse SBR Aircushion midsole features a honeycomb heel grid that flexes upon impact to provide excellent shock absorption Dry-Best? lining transports moisture away from the skin to keep your feet cool, dry and comfortable Aggressive vibram sole with semi-automatic crampon attachment for alpine climbing Multi-directional 3D flex hinge promotes easy flex and a faster break in period