I bought a topper from a company associated with physio.-----  The mattress came and it too had a very high smell of chemicals, so much so it had to go into the spare room with the windows open for about a week.    After that it was fine.

It is now 2 years since we got the topper which cost  110.00pound(GBP). I feel though it now needs changing, it has a lump(best way I can describe it) in the middle even though we moved it upside down and inside upside everyway.  I feel I was sold a real fake.  This was not off ebay but read everything on the description before you decide to bid or buy.,.

Try and buy the best u can afford but it is well worth saving up and getting the more expensive and GAURANTEED..