Caterpillar Wheelbase Steel Toe Work Boot Men's CAT Footwear. When you need the ease of a slip-on work boot to get the job done. The Wheelbase ST is a straight-forward style suited for industrial work environments. The Chelsea-style work boot has all the required protective features, including electrical hazard protection, slip-resistant outsole and a steel safety toe. The Wheelbase steel toe delivers on comfort too with its lightweight and cushioned EVA midsole, and flexible outsole design. Enjoy the ease of this slip-on work boot and the protection it offers you on the jobsite during the day. ASTM F2413-11 I/75 C/75 Steel Toe protects against impact or compression. ASTM F2413-05 1/75 EH Electrical Hazard Protection rated to protect against open circuits up to 600 volts in dry conditions. Cement Construction for added durability.