Just socks
If you don’t like the idea of hot water bottles, here’s another idea to warm your feet, both in and out of bed. Sometimes, advances in technology make us forget the more traditional customs, which don’t work badly at all—for example, wool socks.
While it is true that there are now thermal socks that adapt to our feet, it is also true that there is nothing that warms feet better and faster than a good pair of wool socks. Wool is a material that generates heat very quickly, so if you are one of the lucky ones who have their grandmother around, please ask her to knit you a pair.