Nubuck/PU Nubuck upper. Nylon mesh lining. Removable EVA sock liner. Molded PU midsole. SRX Extreme Slip Resistant rubber outsole. Flexion Engineered construction provides anti-fatigue benefits to keep you working harder all day long. Power by Ergo: ergonomic footwear design providing comfort and flexibility. ASTM 2413-05 I/75 C/75 steel toe. Electrical hazard protection.