The new Speed 4.0 8” Side Zip comes equipped with polishable leather uppers reinforced with nylon for durability. Force Foam heel cushioning, an Ortholite footbed, and a high-abrasion mesh tongue make sure your feet are feeling good no matter the job. The ASTM slip- and oil-resistant outsole and heat deflecting layer work together so you don't feel the heat when your feet hit the street.