Thermal insulation in the walls of a travel mug is quite normal. The reason for that has to do with the amount of hot drink these types of mugs carry. Most people simply don't drink hot coffee fast enough to get away with not having an insulated cup or mug. Although travel containers are meant first and foremost to keep your drinks in your cup rather than on your shirt quality thermal insulation is a good feature to have.
As a rule of thumb it worth keeping in mind that the larger your container the less likely you are going to be able to drink your hot coffee before it goes cold. There is a larger surface of your mugs wall where heat can escape, the top of the mug is usually wider and that give more opportunity for heat to rise and escape, and frankly it takes longer to drink larger quantities meaning you have more time for the heat to escape as well. Basically the larger your coffee mug the more important it is to have high quality insulation.
Thermal insulation in travel coffee mugs definitely adds to the price tag of the mug but it also adds to the quality of the mug and the overall user experience too. While a cheap travel mug may be poorly insulated, light, and very affordable the best travel mug will be safer to use, less likely to leak, more likely to keep your drinks hot or cold for as long as you need them to retain their temperature, and generally more enjoyable to own.
Another reason why travel mugs should be better insulated the larger they come is because travel mugs go outside while ceramic mugs and basic coffee cups do not. In fact many small plastic travel mugs are just used for 20 minute car rides to and from the office whereas many high end tumblers are used outside on a more rigorous basis. During the warm summer months this may not make much of a difference but for someone walking around outside in the winter a well insulated thermal coffee mug will be much better for your drinks than a cheap coffee mug with little to no insulation - the weather will simply cool everything off to quickly unless you drink uncomfortably fast.
Most travel mugs come in sizes of 10 ounces to 16 ounces but there are some larger 24 ounce and 32 ounce mugs on the market as well. Definitely if you buy something in this size range it's worth paying more money for a better insulated mug. The larger containers are usually more expensive to begin with so it may be tempting to buy a cheap thermos but the higher quality items will be much better money spent.
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