SPECIAL FEATURES: Lace-In Heavy Duty YKK Zipper. Stainless Steel Puncture-Resisting Bottom Plate. ASTM F 2413-05 M/I/75/C/75 Steel Toe, Electrical Hazard. Meets the requirements of Cal/OSHA Title 8, Art. 10.1, Sec. 3410 (f). Made in USA by ISO 9001 Certified Shoe Company.