I bought a wicker daybed at a local consignment shop, and the foam cushions are in sad shape. The foam particles have turned to dust, and are exhaling through the fabric!
Here is an excellent video on how to choose foam densities. (The speaker is also in fantastic shape. And that wood paneling behind him is coming back, I swear.) https://www.youtube.com/watch?v=GXihCTYK-RE