To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
simply brilliant ! keeps my drink for the work van fridge cold all day even if iv left the bottle somewhere the sun is shining on it for a while heating the outer skin of the bottle...! dose what its meant to do!!