The mattress has not expanded to the specified size, which is 8 inches. The mattress has been open and out on the bed frame for over 72 hours and is only 4-5 inches on the corners and edges. The rest of the matter is only 6 inches. I had a chat on Wayfair prior to ordering, because I wasn't sure if I should order a 8 or 10 inches. The mattress cover is too big and the pictures clearly show the size. Extremely dissatified!