Stay cool while you dream. The Dream Bed Lux LX510 12 firm mattress is designed with temperature regulation in mind, because overheating while you sleep is anything but dreamy. The Dream Cool Activâ„¢ Technology Cover is enhanced with phase changing material, and the mattress's air mesh sides allow for better ventilation than your average memory foam mattress. It's not just the cover that keeps the mattress cool, though-the Dream Cool Infuseâ„¢ HD memory foam top comfort layer and the OctaspringÂ® comfort system's honeycomb design expel stale, damp air while letting the cool air in. A firm mattress, the Dream Bed Lux LX510 is designed with back and stomach sleepers in mind. If you sleep in either of these positions-or shift from one to the other during sleep-you'll experience premier pressure point relief due to the support that provides proper spinal alignment. And if you do shift in sleep, motion isolation ensures you won't disturb your partner, and your partner won't disturb you. You don't have to take our word for it-try the Dream Bed Lux LX510 mattress in your local Mattress Firm store or by purchasing online to test in your home with our 120-night sleep trial, and experience the sleep of your dreams in no time.