The Classic Bed by Tempur-Pedic™ is 9" in height and features a top layer of Tempur® material on top of a slightly firmer Tempur® support layer. There is an air-flow layer in the middle to let air circulate through the mattress. The Tempur® material works to keep the spine aligned straight to prevent back pain. Often back pain results when a mattress fails to adjust to the body in a way that properly keeps the spine alligned.