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 the softest sheets I’ve ever slept on. After washing and drying them there was very little shrinkage. My only comment was that the material was thinner that I was used to and I found that the sheets did wrinkle.