Review on Stanley IceFlow Stainless Steel Tumbler: Vacuum Insulated Water Bottle with Straw - Leakproof Flip, Perfect for Home, Office, or Car - Reusable Cup by Scott Matute

If this product is insulated and keeps drinks cold then I'm the President of the Moon. I can start exercising and when I left and came back from the house (usually about 2 hours) and then showered to get ready for bed (30+ minutes) all the ice in my thermos had melted. I did 5 different time studies to see how long the ice stays in this thermos and the average is 4 hours 12 minutes. These time studies are based on a thermos filled halfway with ice and chilled (cold) water and kept in an air-conditioned room. I tried another thermos I bought at Walmart many years ago and it held the ice better. Also, the Walmart thermos was at least $15 cheaper. Do yourself a favor and only purchase this item if you plan on drinking hot liquids. Second, just don't buy it. Paying 100% for something that only works 50% is idiotic. So I must be ID10T.