"Drymesh" brand, under cushion matting is really a good product...along with some active ventilation(solar powered if you like).
As for odor issue, not sure. Best of luck.
cushion foam smell removal
Re: cushion foam smell removal
1973 28FB Express "Whisper" on the hard @ Tucker Engineered Lumberyard Yaght Club and Reggae Bar...I dream of H2O, not gravel!