I came from sleep number to Casper hybrid wave. The experience of sleep on a gel mattress was highly doubted by myself and my wife until now. We have nerve damages done on knee and hip surgeries, prior to to Casper we tried a purple number 4. You folks nailed it with the wave hybrid! There is no comparison since now I look forward to sleeping all night! Thank you Casper, your service is second to none as well!Robert and Ellie