What type of hard hats are not ANSI approved class a class b class c bump hat?

Bump hats are not ANSI-approved and do not fall under the classifications of Class A, Class B, or Class C hard hats. Unlike these hard hats, which provide protection against impact and electrical hazards, bump hats are primarily designed for low-impact situations and offer minimal protection. They are often used in environments where head protection is needed but the risk of serious head injury is low, such as in warehouses or during maintenance work.