Lowa Women's Albula GTX Hiking Boot 100% Nubuck Vibram sole Lowa Control System features a moisture management system to keep feet dry that helps eliminate blisters and hot spots C4 Tongue is antomically-contoured for a natural flex that cradles the foot in comfort and provides a faster break-in time X-Lacing uses tongue stud allows for better pressure distribution across the tongue Full-length (5 mm heel, 3 mm forefoot) nylon shank, SPS (Supination-Pronation System) is key to providing support for hikers who will be walking long distances and carrying mid to large pack PU inserts within the softer PU midsole mold we are able to control and ofter prevent over-pronation and supination provides torsional support underfoot