Replace cushions on jack knife sofa with futon mattress

Lynnmor wrote:
We wanted to retain the jack knife sofa, so we beefed it up where needed and replaced the garbage foam with good stuff. If the foam doesn't squash to nothing, the gaps are not much of a problem.

im following this post closely.
due to my loud snoring wife sleeps in front bedroom and i sleep on jack knife sofa. i have been using a twin size 4 inch foam cushion to build up the seat side of sofa. helps a little but by morning im usually about to roll off it.

what type of foam did you use in the cushions?