I’m giving three stars because this topper fits the bed perfectly and is so comfortable.  Unfortunately it smelled like chemicals once I got it out of the packaging.  When I went to wash it the instructions said no machine wash and no dry clean.  So what am I supposed to do?  Hand wash this giant thing in the tub?  It’s ridiculous.  Well, I couldn’t put this smelly thing on my bed so I put it in the washer anyway.  I used the gentle cycle for both the washer and dryer.  It came out just fine but no telling how long it will hold up.