The Restonic Endure Firm EuroTop California King Mattress is the perfect mattress for the coolest sleep. With Phase Change Technology, this mattress incorporates specially treated fabrics that continually adjust temperature so you have a refreshing surface that feels like the cool side of the pillow. The Super Hybrid Memory Foam is next generation and has active air technology to increase air flow, conforms support, and improves pressure relief. The Copper Infused Latex provides anti-inflammatory properties to help with aches and pains and gently lifts your body. Plus, with Restonic's exclusive technology, this mattress delivers an edge-to-edge sleep surface.