Kevin,
You could try a motorcycle accessories shop.
Back when I rode I used a silk balaclava, as a helmet liner, for extra warmth.
I have not ridden for some time now but they may make this type of item in different fabrics which would be more "marine friendly'.
An Ebay search for "neoprene" or "Lycra hood" offered up some interesting options.
(searching for just rubber, lycra, or neoprene can be an eye opener

)
Scott