Upon unboxing No smell, no need to "air out" or wait 24-48 hours. The combo of Talalay latex and memory foam on the sturdy foam base make for a nice mattress. It is a high quality mattress with a very nice cover, not the gauzy type on so many BIB mattresses. It is the type of mattress that you sleep on not in. My first night's sleep was very good on this 13" high mattress, I didn't feel that it slept "hot/warm". It is on the soft side of Medium, the company offers five different mattresses from Very Soft to Very Firm. I am a side sleeper suffering from shoulder and hip issues and after the first night I didn't wake up sore ... Yeah! I did have some issues with the website, but give them a call and order directly from the owner. Very easy to deal with and was concerned when FedEx was late with delivery. I have the Full size which weighs 80 lbs (glad I didn't have stairs to lug it up). NewSleep is a new company but only to the bed in the box arena. They have many years mattress experience in their brick and mortar store. I feel that this was money well spent and hopefully this mattress will give me many more years of pressure free sleep.