I second your comment on high-quality foam. If you're looking at re-doing some old furniture or having your own made, study up on foam - not just the density -

I second your comment on high-quality foam. If you're looking at re-doing some old furniture or having your own made, study up on foam - not just the density - which is important - but also the type and grade. Decent stuff should last 25+ years - and be more comfortable along the way. (A little tip - the density you want for proper comfort varies by the thickness of the cushion, the weight of the intended users, and the whether it's the seat bottom or the back. The back needing a softer foam.)