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.
Not comfortable. I bought it and thought it would last for at least 6 months. Gave it to my husband for Christmas and we had to buy a new pair mid January because they weren’t working for him. He works 8 hour shifts and is on his feet, the feet smelled really badly too and they would hurt. Don’t recommend this for people that have to wear them to work.