For whatever reason, the average office building seems to be kept at a temperature at least 10 degrees F colder than most office workers seem to feel comfortable. This probably is an attempt at a shivering-induced productivity boost, but the fact remains that no matter how many sweaters you wear, your hands are cold while working at your desk. Luckily, the Hand Warming Mouse keeps the chills away and your fingers flexible. For only $23, it may be worth it this winter.