Amazon calculates a product's star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers and factors that establish reviewer trustworthiness.
These are great. Fit as expected. Do not ride up. Easy to wear. Wash like a dream. No shrinkage. No color running. The stretchy material makes this underwear breathable and like super thin spandex shorts...!!!