Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
Love my new drink bottle. Ordered it on Friday received it Tuesday morning free delivery. Beautiful looking and it really works. It’s a humid hot 28 degrees today. I put ice in this bottle at 8.30 am this morning with some water. This bottle does not sweat at all even with ice inside and it’s 3.30pm now and I’ve drank all the water but the ice still has not melted.