Sleep comfortably throughout the night with the 12" Serta SleepToGo Gel Memory Foam Luxury California King Mattress. Designed with an upper layer of gel-infused memory foam and a bottom layer of premium Serta foam core, this California King mattress conforms to your body shape for comfort, while helping align your spine and relieve tired muscles and joints. The CertiPUR-US certification ensures you are only getting premium quality materials without phthalates, VOCs, mercury, lead and other harmful materials. Sleep a Solid 8 Hours Without Disruptions Serta’s SleepToGo gel-infused memory foam mattress effectively isolates other areas of the bed and minimizes motion, so you don’t wake up when your partner gets out of bed in the middle of the night. Gel-Infused Memory Foam and Serta Foam Core Packed with a 2" layer of gel-infused memory foam, this mattress is engineered to improve airflow and release trapped heat to let you sleep cooler. The 3" Air Channel Foam provides breathability and pressure-relieving support. The bottom layer is made from 6.5 inches of premium Serta foam core for lasting durability and support. Enjoy Luxury Firmness to Relieve Your Tired Muscles Get the right amount of sink and bounce with this carefully designed Serta SleepToGo California king mattress. The gel-infused memory foam layer conforms to the contours of your body perfectly, while the layer of Serta premium core delivers solid support. What are the measurements/assembled size? This Serta SleepToGo gel memory foam California king mattress measures 12"H x 71"W x 83.5"L and What mattress foundation should I use with this bed? This Serta SleepToGo gel memory foam California king mattress accommodates most mattress foundations. Opt for an adjustable foundation if you love to read and work in bed. Select a traditional box spring foundation or platform foundation to add height to your bed. Mattress Buying GuideLooking for the perfect mattress for your needs? Click to view our Mattress Buying Guide. Need Help? Ask our dedicated Sam’s Club members-only Serta hotline, staffed especially for you by Serta Mattress Specialists: 1-888-240-1945 available 24 hours/7 days a week.