We are currently on a quest to find the right mattress for us. We tried the Tempur Cloud which was comfortable, but unbearably hot. We then switched to a natural sprung mattress from Dreams Flaxby collection and went for the top of the range. The mattress is cooler, but it is not supportive and actually feels as though it's shrunk. We had to use a natural mattress topper so that the indentations were not so marked.We then slept on a Beautyrest Plush pillow top mattress in New York (Crosby Street Hotel) which was the most comfortable mattress we've slept on, although I found it still a little warm. We want to buy a mattress as close as possible to this one, but one that mitigates heat retention. We've already got low tog duvets and leave the windows open even in winter.We currently have a kingsize but want to upgrade to super king and we need something supportive, yet comfortable like the Beautyrest Black as my husband has an operation coming up and we simply cannot manage with our current bed. Your advice would be very much appreciated. Thank you.