You’ll never believe the kind of technology that went into the Burnout temperature-regulating mug. Rocket science! The patented Heatzorb technology in Burnout is derived from space technology developed by thermal engineers. So you can rest assured that it can handle whatever you put inside. The Heatzorb material lines the inside of the travel cup and is entirely non-hazardous and biodegradable. When you pour in a hot drink, the material activates and melts to remove the heat energy from the hot liquid. As it cools, Heatzorb solidifies and replaces the heat energy back into the coffee. It never needs replacing, and it doesn’t require batteries or electricity. Totally dishwasher safe, this tumbler comes with a lifetime guarantee in the event of malfunction or defect. Finally, made with a triple-walled stainless steel vacuum, this temperature-regulating mug has added insulation to keep your drink nice and hot or perfectly cool.