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.
Very nice product. Material is good. Thich cloth and long t-shirt... so suitable for gym and exercise. Comfortable for daily wear. Only one thing is size is not accurate. So if you opt for two size large than your regular size the fit will be comfortable