Thanks to Serta"s revolutionary NeverFlat™ dual pump system, a better night"s sleep is now within reach. For the first time ever, you can set your airbed to a desired firmness (plush, medium, firm) and the patented NeverFlat™ pump system will continuously monitor air pressure throughout the night, automatically engaging a silent secondary pump to maintain your comfort settings without waking you. NeverFlat™ the premier system for consistent and reliable comfort, all night long. This bed includes a machine washable Comfort Top cover that keeps you warmer and more comfort.