Listing says:
Soft, flexible sun visor that can be used with all styles of helmets.
The cap is made of high quality black neoprene and covered with stretch
nylon. One size. Regular price $18.50
Picture looks like a visor to go over helmet. Not much side or rear
neck sun protection
I left a message, will let you know what they say.
Larry Raskin
TROT-SAR
[MSAR] Cashel Cap - sun visor for riding helmet,
Raskin, Larry, 04/15/2005