We have a split king adjustable bed. Bought Beauty Rest carbon series twin XL mattresses and Beauty Rest platform. Most mattress companies make a mattress that can be used on an adjustable bed. It's just a matter of finding what is the most comfortable one for you. We went with the Beauty Rest because it was really soft/comfortable and felt luxurious to us. Went with the Beauty Rest platform because it was adjustable in that we were able to make it fit within our existing bed frame which was important to me. I did not want to buy another one or just have a headboard attached to the platform. There is a lot of information on line, just do your research first and find your best price. Presidents Day, Memorial Day and Labor Day is supposed to be a good time to buy a new mattress.