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.
Excellent service from amazon, unfortunately this boot wasn’t right for my foot..... it is a very lovely boot so I tried three different sizes. The process for returns and refund was seamless. Not a win for my feet but really happy with the service I received