To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
My home office chair wasn't confirmation and having to work from home for a indefinite period I wanted to get an extra cushion and not break the bank of replacing my chair. This did solve the issue and has made my old chair more comfortable to sit on.