To calculate the overall star rating and percentage breakdown by star, we do not 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.
Does NOT perform as promised. Put in cold water and could immediately feel the coldness on the outside of the flask (what insulation?!) & within 2-3 hrs, water was close to room temperature...very very disappointing... EDITING this review because it turns out the 1st one I got was faulty and Amazon quickly refunded me and I got a 2nd (32oz) & (recently) a 3rd 64oz one and they are perfectly fine! Initially wrote to Ironflask but they explained I had to reach out to Amazon for my refund since I bought it off Amazon. All round amazing service from both Ironflask & Amazon.sg. Very happy with my 2 recent purchases. Highly recommend!