Fill this Honey Bee Vacuum Flask with rooibos tea, a splash of milk, and an ample stir of honey and enjoy it on your morning walk through the wildflowers. Keep a cool drink beside you while you plant a pollinator garden or slowly sip some homebrewed chai while you watch the bees in your back yard.
304 Stainless Steel; BPA free
Here's how it works: the space between the inner and outer flask wall is evacuated, creating a vacuum (well, a partial vacuum anyway...). In order for heat transfer to take place from the outside world into your cold drink, or from your hot drink to the outside world, it needs nearby molecules to excite. If there aren't many molecules nearby, as is the case in a vacuum, the heat's energy can't easily be passed along, so your drink stays close to the temperature it was when you put it into the flask for a really long time.
Simply stated, vacuums make great thermal insulation!