I’m so disappointed with this mattress! Originally I had thought it was quite a clever set up with three equal sections of dense foam, however the foam compressed where my daughter sleeps (5’1”, 110lbs) to form a substantial dip in the mattress. This is not memory foam, so once compressed the foam does not bounce back. We tried flipping the mattress as well as moving the order of the pieces around, but the significant flat spots prevent the pieces from lining up and the shell that they are zipped into is not able to maintain enough tension to keep them in place. Unfortunately after 6 weeks I have had to replace this mattress with another.