Marriage issue was resolved very quickly. Replaced thermos pleased. During the day, heat loss was a small percentage. Water, of course, not boiling water, but remained piping hot. Thank you for your help in replacing the defective thermos! We plan to replenish the family of arctic thermoses in the near future. ) Some pros: Ordered a thermos Arctic. Stylish, comfortable, just what we need for our family trips. We have three of them, 2 liters each and one 0.6 liters. There is enough tea and soup for everyone on the road. )) Has cons: I had no luck with the last thermos I bought. Not immediately noticed that the outer capsule is heated, and the contents quickly cool down. Marriage.