We bought the full size for the bottom of our bunk bed. It’s supportive and solid, sits without issue on platform style bed. Although it’s used for our 3 year old, my 5 year old also sleeps on it often, and I’ve been known to take a nap or two on the bed with both kids. It’s comfortable enough to support kids and adults. I would recommend for the . We had no issues with smell, and it was full size after we took it out of box and laid it out in less than a few hours. I would recommend for a not too pricey mid- level mattress.