First of all, I was going to be impressed at the speed to which this was delivered however, I ordered a king and got a twin. When I finally received the King I liked the comfort, like a dense sponge no issues. I let it inflate for one week as opposed to just the suggested 72 hours before use, but it never got to 12 inches as described. You can see the pictures, it only got to 10 inches after five days. This is a disappointment, which is why I only gave it four stars. ￼