Columbia Men's Bugaboot XTM Omni-Tech Snow Boot 100% Leather and suede Rubber sole Internal lining and footbed cover with AgION anti-microbial treatment 600g Thinsulate insulation with additional underfoot insulation. Molded EVA Techlite footbed injection molded material with nylon shank Non-marking dual-density Omni-Grip advanced traction rubber compound for optimal traction in winter conditions Injection-molded waterproof thermal rubber shell provides lightweight, durable protection