Looking on behalf of a friend who lost theirs on a ride. Their favorite bit of kit... unlike the jacket pocket that failed on them!
I hoped to do an attempt at a good deed and see if someone on LFGSS has one sitting in a drawer somewhere perhaps and happy to sell it on.
They came in many colours/patterns (such as attached) but don't make them anymore. One size only. Thick knit compared to the common thin 'buff' style and have a drawcord/drawstring on one end to tighten it up.