Recommendations for soft seat with back support to install on raft poly deck?

I'm having a poly deck installed on the front of a new raft frame. Typically I will strap a taco pad on the deck and the passengers will sit on it. However, I have a passenger with back issues and I'd like to find a soft folding seat that I can strap on top of the deck that will provide some back support for this passenger. The seat will need to have straps on the front and back of the seat bottom that I can run through holes in the deck to snap together that will secure it to the deck. I...

Recommendations for soft seat with back support to install on raft poly deck?