[Paddlewise] cell foam seat

I have a carved foam seat.  It does absorb some water, so my 
butt gets damp while paddling if it has been raining for a while 
and some water gets in the cockpit.  I'm contemplating some 
sort of waterproof nylon cover, but that could be slick and 
would introduce wrinkles.  I'd like to hear what other solutions 
people have to this.

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