A hard hat is a helmet-like protective head covering used to
shield the wearer from painful or damaging blows to the skull.
Once made of metal, modern ones are made of sturdy plastic.
Besides the hard outer shell, the hard hat also has a fabric
mesh or straps on the inside, set about an inch or so away from
the shell. This mesh is what rests on the worker's head, instead
of the shell, to provide a degree of shock absorption due to
especially heavy blows. Additionally, an adjustment mechanism of
some kind can be found on the back, which is used to adjust the
hard hat to the wearer's head for a secure fit. Some have a brim
around the edge to direct liquids away from the wearer, in case
of rain or liquids spilled from above. Others have a short bill
in the front like a baseball cap. Hard hats can offer several
attachments depending on design. Some have ear protection built
in to the side. Some have a spot to attach a face shield for
tasks like grinding and pouring chemicals. Others can attach a
welding mask. Usu