I mean it simply does what it does.
Our mattress pads are made with "Phase Change Materials" - PCM for short. These new fangeled, scientifically created fibers and coatings are similar in functionality to ice cubes - but without the wet.
Ice cubes "change phase" when you hold them - they absorb your heat and melt. Our materials absorb your heat, but unlike ice cubes, when your temperature goes down, then they release that stored heat back to you.
And why do this? Well - by absorbing, storing and releasing some of the heat you generate, the fabric is actually responding to your changing skin temperature. This response helps assure you get a better - and cooler, more stable - nights sleep.