Thermacare heating pads for the wrist

I saw something on television last night that caught my attention as a writer that I think would be worth looking into. They are those Thermacare heating pad things, but they are made to wrap around the wrist to help sooth arthritis pain. It looks to me like something that would be good for cramps from writing as well. I want to get me a pack of them to test out the next time I go to town, I'll let you know what I think of them when I do.