Despite all the latest changes and improvements implemented on foam and latex mattresses, they inevitably still feel hot when slept upon. Of course, compared to how it was a couple of years ago, they are apparently a lot cooler (and bigger) now. King size mattresses are no longer the sole choice of couples, but even single users who sleep by themselves prefer larger beds. For instance, the king size mattresses here are extremely popular in the U.S. Mattress manufacturers are also investing heavily in the process of manufacturing better and higher quality foams. Pioneers like Tuft & Needle, as an example, seem to be doing surprisingly well with their supposedly custom form of polyfoam that they’ve created from scratch.