The comfortable cushioning and body-contouring properties of memory foam are why it's one of our favorite mattress materials. Memory foam beds pop up regularly in our best mattress guide and they're often our top choice for side sleepers. However, while sink-in comfort might be one of the greatest strengths of memory foam, it can also lead to its biggest weakness: overheating.
Memory foam mattresses do have a reputation for sleeping hot. This is due to the structure of the material: the dense foam holds on to heat, while the soft cushioning creates lots of skin-to-mattress contact, trapping warm air. However, sleep brands have come up with some innovative ways to tackle the poor temperature regulation, and nowadays many of the best memory foam mattresses actually maintain a comfortable temperature even on warm nights.
