I had been using a rigid wooden mattress because of my lumbar spine condition.On the recommendation of my friend, I decided to try the Gel Memory Foam mattress this time, and the result was as good as I expected.For my lumbar spine, the effect of Pressure Relief is very obvious, and I won't feel back pain in the morning.The unexpected feature is cooling sleep. It's getting really hot in California these days, and the breathable mattress keeps me from getting hot and sweaty when I sleep at night.Valuable!