Upper: Brown Full Grain Oil-Tanned Leather. Construction: Goodyear Storm Welt. Insole: Removable Polyurethane. Outsole: HEAT RESISTING Vibram ALPHA+ Sole. Special Features: ASTM F2413-11 M I/75/C/75/Mt/75 Steel Toe, EH Rated. Tested For and Meets CAN/CSA-Z195 18,000 Volts Electrical Shock Resistance Standard. Patented I-MET Technology.