I tend to have cold hands anyway, but spending hours using a computer, particularly a mouse, and my hands get icy. Sometimes I have to stop writing and go warm up my hands. I finally decided to get a pair of fingerless gloves.
There’s a bunch of them on Amazon, where I got mine. I was going to include a link, but the ones I bought are sold out. Run a search for “Women’s (or Men’s) Fingerless Gloves” and you’ll see a bunch. Read the reviews before you buy, because you’ll get details about sizing and quality. The glove I bought, for instance, tend to run small. They’re perfect for me, because I have small hands, but wouldn’t work for many people.