The black Blundstone 510 men's Chelsea boots feature a premium leather upper. Durable boots feature a removable XRD technology insole for shock absorption and to reduce impact on feet and joints. Polyurethane midsole for extra comfort. Thermo urethane outsole is highly resistant to hydrolysis and microbial attack and offer grip on any surface. Tough boots are oil, acid and organic fat resistant. Ergonomically engineered toe spring reduces fatigue. Gussets on both sides for easy slip on and off.