One of the knocks on memory foam is that it can be hot for some users. This is really due to the very dense nature of memory foam and, consequently, an even a more open cell structure will not breathe very well. This prompted various ideas of how to keep a memory foam mattress cooler, including using a gel infusion with either beads or mixed right into the memory foam itself.
The problem with gel is that it is a conductive substance that responds to the environment around it. This makes it great for those who want to temporarily cool off when getting into bed, but users should know that the coolness won’t last throughout the night, since your body’s heat will warm up the gel more than it would other less conductive substances. Also, gel infusion has not been around long enough to prove its durability and, in fact, it is a well know fact that gel beads easily separate from the memory foam.