edwardjhon

One model from Thermos that already has this feature in its name has not yet been mentioned: Thermos Ultimate Insulation. I own the 0.9l model and I'm thrilled with it. They are also available in 0.5l sizes. An acquaintance of mine conducted a test by filling a kettle with boiling water and then placing one in the freezer overnight, comparing different models. The contents of the Ultimate Insulation kettle were subsequently 10°C warmer than those of the comparison models.