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.
Great product. I have bought the same shoe before and this one is exactly the same. The only difference is the price. This is by far the best value for money as it is half the price that I have previously paid. Will come back for more!