Coffee joulies is placed in your coffee cup - it is supposed to instantly cool your coffee just enough to make it drinkable, then keeps it that temperature for up to 3 hours (could this really work?)
it is cotton because duh it is made from plants with mother nature not from some dude
Waterproof Canvas, hands down.
CottonThe threads have thousands of little threads joined together to form a single threadThe water goes between all those tiny threads and stays therePolyester has a single one-string thread for each thread, so the only water goes on the outside of polyester.
Yes, they do in fact, workI have tried them for myself and was very impressedJust drop one into your cup of joe, and in about 1 minute you can take a big sip of coffee without burning your tongue completely off(Although I wouldn't recommended just downing your coffee even with the joulies in it.) How they work is fairly simple; first, they absorb extra thermal energy in your coffee when it’s served too hot, cooling it down to a drinkable temperature three times faster than normalNext, they release that stored energy back into your coffee keeping it in the right temperature range twice as longThis amazing feat of thermodynamics happens thanks to a special non-toxic material sealed within the polished stainless steel shellThis material is designed to melt at 140 degrees Fahrenheit, and absorbs a lot of energy as it meltsThis is how Joulies cool your coffee down three times faster than normalOnce it reaches this temperature, the special material begins to solidify again, releasing the energy it stored when it meltedThis is how Joulies keep your coffee warm twice as longThe better insulated your cup, the better Coffee Joulies workSimply using a lid goes a long wayThis is because less heat is lost to the environment, and more is stored within the Joulies themselvesIn a ceramic mug Joulies will keep your coffee in the right temperature range for only a few minutes longer than usual (because mugs are such poor insulators - designed to keep your hand from being burned, not to keep coffee warm)Of course this isn't a problem when you're rushing to get to work in the morning and Joulies help you drink your coffee three times sooner.
