I purchased the Sultan Tafjord memory foam topper from iKEA. When I got it home and opened it the chemical smell almost knocked me over.
After one month of outgassing the topper in the garage and washing the cover, it is still not usable. When I tried to sleep on it, I woke every morning with a headache and sore throat, not to mention all my bedding smelled strongly of it. I'll stick to the toppers at Macy's next time. Don't waste your money.
It is too bad because it is comfortable and has a nice cover. They are not returnable.