The steel toe protection and comfortable support of the Caterpillar Outline ST boot will make sure you perform at your best every work day.Leather upper.Steel toe work boot. Padded collar for added comfort. Traditional lace-up design with sturdy metal hardware for a secure fit. Nylon mesh ling provides airflow for added breathability. Cushioned footbed for excellent underfoot comfort and support. Electrical hazard and slip-resistant rubber outsole.Steel toe rated: ASTM F2413-11 I/75 C/75, which is the highest possible strength for impact and compression.EH rated ASTM-F2413-05 1/75 protects the wearer against open circuits up to 600 volts in dry conditions.Durable rubber outsole has a high traction design and is oil and slip resistant.