ok i know nobody measures support factor for fiberbeds or wool toppers but i think if it was measured it would be very high - 5 or higher.
that’s because support factor is pretty much the inverse of surface firmness of which fiberbeds and wool toppers have none, so anything divided by zero is bound to be pretty high.
every type of sofa and stuff that i have has polyester fiber on top of the poly foam - the more fancy sofa i have has a pretty substantial amount of it.
are we overlooking fiber ( and wool ) batting in our obsession with foam ? i think we are.