Seat foams and plastic

["J. Adrian Barnes" <adrian@icx.net>]

I was tearing apart one of my seats today to see what the rebuild would
involve.  It was pretty nasty.  What looked like popcorn kernels came
pouring out of the seat all over the floor.  The top of the seat foam,
just under the headrest, was wrapped in plastic, to about half-way down
the seat.  Is this normal?  It looked like a good idea, to keep water
out of the foam.  But I could imagine water getting trapped under it
too, and mildewing.

adrian