Very comfortable mattress. We allowed it to expand for 48 hours without sheets or anyone laying on it as recommended. We took our old mattress out to the living room and slept out there with the kids (which they loved! We made it a family sleepover party for 2 days) while the mattress expanded to it's full 13 inches. It is firm, yet the foam top layers hug your body. As with any new mattress, it takes time for your body to adjust to it. I have had issues getting used to it as it is so comfortable and supportive.