You may think a sofa topper is just for protecting your couch's fabric from stains and wear, but a padded design can introduce another layer of soft, supportive cushioning to your sofa's seat.
If returning the sofa isn't an option, you can take the cushions out and replace them with down-filled or down-wrapped foam cushions you can find from an upholsterer or sometimes online.
These GreenRow toppers have covers that can be changed like duvets, so you can get different looks without buying a completely new topper.
If the issue is more that the sofa is lacking in support, then you can foam-wrap a board.
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