In case it's of interest, I bought a great one from Dunelm, called Gel Fusion I think. It's a mixture of memory foam and gel, the gel stops it from getting hot, and it does work. Having slept on a pure memory foam topper, there's a huge difference. I bought it nearly & years ago, and it's still as good as new. It's really comfy too, nice and soft. Money well spent! 🙂