Seen many of these in my day.
Acme Ventilated Plastic BUMP Cap
Ventilated for all-day comfort.
PROTECTIVE, YET COMFORTABLE. Low hazard, well ventilated and lightweight for total comfort. 4 Point suspension, HDPE shell, and pin lock adjustment from 6-1/2 to 7-3/4. Ideal for food industry, mechanics, truck drivers and maintenance departments.
On the way to work Beaner wonders if he will ever see the lawn mower again.