Aha! A helmet solution!

don't bother!
those things are some of the ugliest i've laid eyes on in my short life.
they consist of a non padded badly fitting bowl of expanded polystyrene with some sort of poor quality cap, with untidy seams, on the outside.
sorry

Screw them then.
I'll make my own.
Or perhaps commission a Smeear version?

Or just buy a normal (read: ugly) helmet.
Or just keep meaning to and not get round to it…