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.
Good mask, decently made with a comfortable fit, but I only received one mask and two filter sheets instead of the 2x masks and 4x filter sheets advertised. Not sure how to rectify this, but not what I paid for.