Self-cleaning outsole design proprietary to Blundstone. Excellent grip on wet, muddy and slippery surfaces. Vibram® TC4+ technology sole. Premium weatherproof leather. Vibram® thermo-urethane outsole resistant to hydrolysis and microbial attack. Injection molded Vibram® rubber outsole and PU midsole with patented SPS at strike zones for all-day comfort and shock absorption. Highly resistant to oil, organic and inorganic acid. Heat resistant sole to 300°C and specifically rated to maintain performance down to -15°C. Lightweight and flexible. Premium Comfort Lite removable footbed: breathable, washable and anti-microbial Extra set of footbeds for fit adjustment. Hidden stitching in the heel. Leather lined. Please refer to size guide