The MOLECULE CopperWELL 12 in. mattress improves sleep quality with copper-infused gel memory foam, providing the perfect blend of pressure relief and support. Its open-cell foam structure enhances breathability with active heat transfer for the ideal sleep temperature. Memory foam delivers ample support in key pressure point areas, while the copper gel pushes back to the areas with less pressure. Targeted support helps keep your body in alignment for deeper, more restorative sleep. MOLECULE is tested and approved by the world's elite athletes, including Alex Morgan and Michael Phelps, helping them rest and recover while they sleep so they can maximize their performance during the day. Sleep like a Champion. Sleep on MOLECULE. Size: california king.