dh@. wrote in :

A lot of people around here have covers made for their
boats that will go around the front deck or a rear deck,
custom made of fabric and heavy flexible clear plastic
sown together, and it usually snaps and zippers in place. I
don't know what to call them. What I'm mainly interested
in is the plastic. Can anyone tell me some specifics about
it so I have an idea what to look for, and maybe even
where to get it?

The best product on the market is called StrataGlass. You can find them at
www.strataglass.com It's a vinyl laminate with scratch resistant surfaces
and blocks 100% of UV. It is expensive, but you won't end up replacing it
in a few years due to yellowing or deterioration.

You really need to follow their care & cleaning instructions. The Imar
Strateglass cleaner works very well.

-- Geoff