I bought a fiber bed cover a few months ago, it's 3" high. My DH and I have very bad backs and this has made a difference. We were hopeful, but not optimistic, but it has been such a nice surprise. I still don't sleep thru the night, but it is so much more comfortable on my back. My DH used to get up to sleep on the couch, now he sleeps in the bed. I haven't smelled anything odd about it, and my sense of smell is always ON. They had a sale at Linens N Things so we got it for under $100. They are going out of business, so they are selling off stock, this might be the time to check for bedding and such.
God bless. Alice.
I also bought a memory foam topper last year. It did have a chemical smell for a week or two. It seems to help. I think next I will buy a memory foam mattress.