Sonic the Hedgehog is a popular video game, loved and played by many. Sonic is the fastest thing alive, as he runs at supersonic speeds. He is often chased because others want to steal his speed. He and his friends have many adventures in this popular game. This Sonic heat-changing mug features a design that changes when you pour your favorite hot beverage and it heats up. . Hand Wash. Do Not Soak, Do Not Microwave. This is an awesome product and is sure to be a favorite of any sonic fan. Make a great gift too.