These Dr. Martens men's Bolt boots are built tough and ready to take on whatever challenges are ahead. The full-grain leather uppers are slightly milled and snuffed, and they have a medium to heavy pull up and strong, oily surface for durability. Industrial strength cord laces on the Dr. Martens boots allow you to adjust how tight you want them, and heavy duty metal logo eyelets add a touch of sophistication. Hard-wearing, air-cushioned PVC outsoles and contoured cushioned insoles add shock-absorption. You cross various terrains throughout the week, so you'll appreciate this support. The rugged soles of the men's shoes are slip-resistant as well, and they're compliant with a slip rating of ASTM F1677-1996 (Mark II Machine). The air-cushioned PVC soles also meet an electrical hazard rating to keep you safe around open circuits. The removable, contoured, and cushioned EVA comfort insoles, paired with a breathable mesh foam-backed lining, will provide your feet with necessary comfort and reinforcement. The padded collars also give you extra cushioning. Material: Leather.