I will save many customers much AGGRAVATION... do NOT get the king beds that have the dark gray air chambers! They create a horrible lump in the middle and if you like to snuggle (or more intimate things) with your partner, it is VERY uncomfortable for one of you. I have dealt with Comfortaire for years on this and they always try to convince me there is nothing wrong. FYI - I own 2 of their beds and the one with the lighter gray chambers don't have the rim all the way around each "twin" chambers. That bed is basically fine. The air in both beds need to be refilled more often than I thought they would. We have tried to fix that by buying new pumps, etc, but it doesn’t completely solve the problem.