We ordered this mattress to go with a platform bed frame that did not require a box spring. We were so nervous about ordering a mattress online without seeing it in person but Im glad we did. It came on time, I opened it as soon as it came to give it time to expand to its full 10inch. It took about a full day to expand fully. Its so comfortable you dont sink in or anything. It is for my sister who who has cancer and she normally has a hard time getting comfortable on her old bed. But she said it really formed to her body she didnt have to toss and turn to get comfortable. I would definitely recommend this mattress!