The copper-infused layer in the SleepMor 10 Inch Copper Infused Medium Mattress, CA King, is made of memory foam infused with copper. Copper has antimicrobial and cooling properties, making it an appealing addition to this comfortable and versatile mattress. The copper properties help reduce the growth of bacteria, fungi, and other microorganisms, contributing to a cleaner and healthier sleep environment. Product Details: • Memory foam contours to the shape of your body as you sleep • Compatible with adjustable foundations • The medium rating offers the perfect balance of support and cushioning