Fit Traditional Lacing Thermo Adjustable Fit – Thermoformable materials are heated so that boot volume can be changed. The boot adapts itself to the foot. Liner Polyester Design Lateral Plastic Reinforcement Sole Touring Sole – The flexible central insert gives the boots optimum comfort as well as torsional rigidity for added stability. Additional Features PVC Lace Cover Rossignol XC2 Cross Country Ski Boots