We got the mattress almost a week early which was amazing. Once we opened the bag, it was up to full size in less than 30 minutes. We aired it out overnight anyways, but didn’t need to. There was a tiny smell of you put your nose to the mattress, but nothing to be bothered about. My kids all fight over who gets this mattress. It’s comfy and amazing. My only drawback is how tall a 12 inch mattress is. I should have paid more attention. It was supposed to be for the bottom bunk and it’s way too tall. Luckily, I can swap the mattress for a shorter one that we have. Ha. That was my mistake.