These safety toe Thorogood boots meet ASTM 2413-05 M/I/75/C/75 ratings. Class I/75 footwear retains a .500 inch (1/2 inch) for men’s and .468 inch (15/32 inch) for women’s or greater clearance after a nominal impact of 75 foot-pounds (101.7J), i.e., a 50 pound weight dropped from 18 inches reaching 117.9 ± 2.4 inches per second velocity at impact. Compression: Class C/75 footwear retains a .500 inch (1/2 inch) after compression of 2500 lbs. (11,121 N) or greater. For the protection you need, choose Thorogood boots!