Have you ever slept on these foam mattresses before? if not, I recommend you try and have a trial first because I had to sleep on one for a couple of weeks during very hot weather. I won't deny that it felt very comfortable at one level but the sponge material retained so much body heat that it was like sleeping on an electric blanket that was permanently switched on, on the hottest setting. I believe Tempur used to offer the opportunity to try a mattress on approval first before buying. Don't know whether this is still an option.