This mattress comes rolled up in a huge box and you unroll it and wait for it to expand to it's full 10 inches - which only took a few hours. It does have an "interesting" smell for the first week or so, but nothing too over-powering. The first night I slept on it I had dreams that I was sleeping on the ground because it is a very firm mattress and I wasn't sure I was going to like it. Now I can't imagine sleeping on anything else. My back no longer feels sore when I wake up and I'm having the best sleep I've had in a very long time.