Look inside those covers, too
Please please.... keep in mind...
that while well-cared-for covers can last for several decades, the factory-original foam inside goes FLAT when you sit/lay on it after as soon as 5 to 10 years. Unused or seldom-used cushions will keep their "loft" longer, but cheap foam breaks down by time alone.
Average density of new boat foam is about 1.8 (or sometimes even less) and the
firmer Good Foam will be at about 2.6 density.
In '95 we had the flattened-out original foam replaced in our '88 boat, and the upholsterer that did the work (some repair and resectioning was involved) gave us quite an education in choosing foam. He had 40 years (!) experience.
Here we are in 2014, and our cushions
still sit without bottoming out and sleep comfortably with no pressure on the old hip bones. Visitors for happy hour always comment on how comfortable our cushions are.
Something for you to think about before you pull the trigger on those spiffy new covers...
Loren