After a few days of so called "degassing", mattress are now not as smelly as before, and my pregnant partner instantly felt the difference. After classical Coil mattress back pain is gone. But after labour DORMEO mattress brought even worse pain in the back, so my partner couldn't even move from the morning. Today we brought a coil mattress back and the problem is gone. I guess it might be individual, but I'll never buy a Medium soft or Soft mattress again. And DORMEO didn't work as promised. Only hard mattress from now