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.
They mentioned satin in the name and showed up in search for silk pillow covers. The iteam is mixed cotton. Neither silk nor cotton fully. Fits well, color is good but not what I expected. If you are looking for satin pillow covers for hair fall prevention then this is not it.