Genuine Grip 101 Athletic Work Shoes Rubber Sole Patent-pending, Genuine Grip, slip-resistant rubber outsole delivers superior traction to help keep you steady on your feet. Removable, Walking On Air polyurethane insole helps to reduce leg fatigue. Moisture-wicking liner is treated with antibacterial Aegis Microbe Shield for a dry foot environment. Easy-care leather upper is oil and water-resistant. Material Content: leather upper, mesh upper lining and sockliner, polyurethane insole and midsole, plastic shank, rubber outsole.