It's the best mattress guarantee in the industry, made possible by manufacturing our own mattresses and designing them to be adjustable. If your mattress feels too firm - no problem. We'll adjust it. Too soft? We got it. We'll perform our exclusive Comfort Adjustment service even if there's nothing technically wrong with your mattress. All that matters is your comfort and how it feels to you. And, we'll continue to adjust it for the lifetime of your mattress.