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cheap lid
I'd have thought any open faced motorcycle one would be fine, right?
Then search for your nearest infinity bike shop.
EDIT: Nope. Apparently car helmets are fire retardant, whereas bike ones aren't.... Is that actually true?
unless there's a load of fancy comms equipment, I'm struggling to understand why a car helmet should cost more than a couple of hundred... Supply and demand maybe?
+1 on trying plenty though. And spend a bit of time wearing the one you settle on around the shop. From a bike perspective having nice quality, wicking, removable liners is worth having.
Also, what’s a cheap lid that will allow me on track without having to rent one?