Copper is the second-most conductive element in the world. That means thermal energy (a.k.a. heat) sticks to it like a magnet. Infused into our cooling memory foam mattress, copper acts like a little team of hardworking nice guys who pull the extra heat away from your body. This keeps you from breaking into a sweat every night (nobody wants to see what that does to a mattress over time). A copper cooling mattress keeps you cozy and lets you sleep like a temperature-controlled log.