Ive got a piece of memory foam that is 80inches long and and 50inches wide and 2 inches thick. ive layed in in my Hammock to see how it fits and it needs some cutting. However I noticed it did get flat where where the pressure was. So I ask. Would that be a poor choice for a cold weather pad? and Second do to its density would it make for a good material for an under quilt? It does roll up and pack small...? Thanks for any advice.. Also, Ive never hammock camped in the late fall or winter.