During the winter months, it can be difficult to stay warm. Putting on multiple layers of clothing helps, but the best choice is to stay in a blanket burrito. You can’t stay that way while working at your desk though, so you’ll have to seek out ways to keep your extremities from freezing.
The hand you that you use for mousing is always the coldest by far, so why not get it a Futon Warming Mouse Pad? This is literally a heated blanket just for your mouse hand that can get up to 122 degrees Fahrenheit. You could actually burn yourself if you’re not careful. In addition to its heating abilities, it has a pillow for your wrist, and Velcro to really seal in the warmth. This will cost you around $25, and would probably only be useful to people who need a little help keeping the blood flowing in their hands.