Enjoy independent comfort on each side of this Split California King mattress from Tempur-Pedic. The dual-zone climate control system helps both partners achieve their ideal sleep setting. The Tempur-Ergo ProSmart Air Base uses specially designed fans to quietly circulate cool or warm air directly from the base and up through the mattress for all-night comfort, and must be paired with the Tempur ActiveBreeze mattress to enjoy full climate control benefits.