It all depends in what YOU want from them. A bolster is not always a bolster (no play on words). Some keep your back from hurting more than others.....but I would think that the style of boat would make a difference. They have a few different models. As I said in an earlier post....there was another company in California, but when I hit the link.....nada....so I don't know if their out of business or change web-sites.
You can also check this out... http://www.bolsters.com/index.html
the one pics lookslike a taxi boat set-up...
I just called Offshore Performance Products in CA and they didn't know that the web-site was down. Here it si..check it out later http://www.offshoreperf.com/
A nice selection of bolsters