I bought a 2015 SS211 and love it. Unfortunately the seat foam was broken down in all the seats even though the boat only had 68 hrs on it. I found a great replacement foam at Sailrite. Used 2 full buns of medium density antimicrobial marine foam measuring 3”x36”x80” and it did all seats except the 2 captains seats that were in good shape. Cost was about $70 for each piece $140 total.
The new foam foam looks to be more dense and much more substantial that the OEM foam. The job was easy to do - laid each cushion on the new foam, traced and cut to size. Each cushion had a zipper so easy to remove old foam and replace. Pictures show the old foam in yellow and white being the new one. I posted this in case anyone else suffers from the broken down seats like my boat did.