Some Cons
Personally, I prefer Sunbrella on both top and bottom of cushions for both inside and outside cushions. I'm afraid of vinyl getting brittle and cracking with age. A vinyl bottom would be slippery. In some cases vinyl increases chances of condensation. I throw my Sunbrella cushion covers in the washing machine - not sure if that's advisable with vinyl. Inside the boat, I glued 1/4 inch foam to the seat and bed surfaces. This acts as insulation to illiminate condensation and provides a non-slip surface fore the cushions.Bob MillerHunter 37C"Gusty Getaway"