VISCO elastic mattress is 7cm unfortunately for me too soft, thereby causing you to sagging in the lower back, which greatly enhanced my Lumbagoschmerzen; the sun is pleasant feeling for a certain period, but then come the Lumbagoschmerzen that I had with my soft mattress. Is in the shoulder and upper back the chairs comfortable. I had (as medium hard the name was) wished for more stability in the lumbar area. Too bad !! Have the edition is now placed under my mattress on the grate, which makes lying a little more comfortable than before, but more than 2 hours sleep at a time still can not be in it. ; Then turn comes u. u Turn Turn u ....