I bought 2 of these mattresses along with 2 single beds for my daughters. However, the mattresses are about 3inches or more shorter than the bed. I left it a few days hoping the memory foam would expand but didnt. The kids are having to put a pillow down the gap which isnt ideal. The mattress itself is extremely comfy according to kids however we will need it replaced. We were told it must be a manufacturing fault and have been offered a replacement, however the fact we have 2 and both are short, im not convinced. The replacement cant be done now due to current circumstances which is understandable, but if it gets damaged in the meantime or if it gets stained is the exchange still going to go ahead