Tried a topper a few years ago on a sofa bed that had been really uncomfortable and it made such a difference decided to get one for main bed. Unfortunately this one really smells.  I know that duck and goose down can be a bit smelly so I have spent a few months airing it regularly and have also had it laundered professionally to try and get rid of the smell but it is not getting any less pungent. it actually makes me feel ill. No longer being used. I am never buying feather products again and would recommend buying a synthetic version instead.