I just received a pair of these ergodyne Skullerz " bump cap inserts " , goes inside a ball cap and gives you a very light duty hard hat.
I'll be putting this in my work uniform hat.
Not good for major protection , just a little protection from minor bumps that are more annoying than anything
Theres one thing I do weekly at work where I'm always bumping my head on these fire suppression nozzles, and it really just pisses me off.
On first impressions it doesn't seem uncomfortable or anything, but if I don't like it I'm only out about $6 a piece.