The hard hat suspension is just as important to worker safety as the shell. The suspension actually helps to absorb the shock of a blow, so it must be in good condition at all times.

The hard hat must also be accompanied by the manufacturer's guidelines for care and service. Inspection, care and maintenance The hard hat has two basic parts: the shell and the suspension system.

And given that we've learned that Biden, in this case, was wearing a hard hat that had been configured to be worn with the bill facing backwards and the suspension reversed so the nape strap and ...

He designed the first-ever hard hat in 1915, which was made from layers of canvas that were steamed together with glue, a featured a leather brim, and a shock-absorbing suspension device inside.