Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
Each of these poufs lasts you a long time. So getting four in a pack will last you for a really really long time. Doesn't feel rough on the skin like some of the cheaper plastic alternates. Would highly recommend this.