skid-lid

skid lid

A padded used to protect the head of someone riding a bicycle, motorcycle, or other similar means of transportation. I wound up with a broken arm and some bruised ribs, but thank God I was wearing my skid lid, or it could have been a lot worse! Look at that guy! Zipping through red lights, weaving in and out of traffic, and not even wearing a skid lid!
See also: lid, skid
Farlex Dictionary of Idioms.

skid-lid

n. a motorcycle helmet. The law has no business telling me I gotta wear a skid-lid.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • skid lid
  • riding
  • biker
  • crunch up
  • out of necessity
  • wheely
  • pop a wheelie
  • wheelie
  • wheelies
  • the village bicycle
References in periodicals archive
At this time of year I pull on my skid-lid, saddle up and head on to the roads to spot Nodders, Wavers and Sulkers.
Richard Hammond: Waves of emotion; WHY FRIENDLY BIKERS GET THE NOD FROM ME
If you're still riding with one of the older hair-net type helmets or "skid-lids," you should definitely invest in something new.
The naked cyclist