Some reviews mentioned a chemical smell. It's been well over a month and the chemical smell from the mattresses is pungent still. I left windows open several days and can't get the smell to go away. It's winter here and that makes it harder to air out but with this much time it should have dissipated. I worry the chemicals will be harmful to my boys. I bought 2 of these for their twin beds. Wish I could put them back in their bags and ship them back.