More than just a simple design for the hand. The high-tech, low-conduction glass material keeps your tea, coffee or soup warm for longer than any other material. No other glass will maintain a look as new and clear as this borosilicate glass - even after two to three years of dishwasher use. The handle is made of reinforced nylon and is easily removed from the glass for cleaning. But this is not a must; it stands up to the dishwasher as well as the cup itself.