Pretty good.
I purchased this product for my mom who suffers from 'cold hands' all the time. What I really like about this item is how warm the product gets. What I didn't like was that there weren't covers for it (like a heating pad). I made them myself. The plastic edges are very scratchy and would probably cut my mother's paper thin skin. I made the covers out of fleece (lined inside and out) and they're very nice now... :-)
Rating: 4 stars