Some so-called "hybrid" innersprings include one or more levels of foam on top. A layer of foam infused with gel, which is claimed to make you feel cooler in bed, especially with memory foam.

Purple's most affordable bed, the PurpleFlex Mattress, features its signature gel grid for great pressure relief, spinal alignment, and breathability.

Some so-called "hybrid" innersprings include one or more levels of foam on top. A layer of foam infused with gel, which is claimed to make you feel cooler in bed, especially with memory foam.

With its 30cm depth, this is a plush mattress with a satisfyingly firm spring structure. It includes memory foam that is infused with gel microbeads to help regulate temperature and keep you at ...