This one was a Christmas gift to daughter and son-in-law. Parents of tweens are throwing so much money at the kids' activities, they sleep on a mattress that gives them a back ache. I bought this for them, it puffed up to the full 11 inches in about 6 hours and they slept on it the first night. No smell. Just freshness and softness. They were so comfortable, they could hardly get out of bed the next morning. I have one too, and I love it so I knew they would. I have bought them for all the grandchildren and my guest bedrooms, plus some I have never unpacked for disaster preparedness when we might have to take in more people.