Bouillotte foremost

Let me be clear, these boots are not slippers, it is primarily a water bottle perfect for chilly feet.
You can not walk at all because with seeds that are in the sole are made to walk to the front of the liner with the movements of the feet.
But hey, this is not the use I wondered. I wanted boots to warm my feet when I moved to my office, or watching TV, and there, it's just perfect!
1m30 MO enough to bring these boots in temperature. They perfectly envelop the feet and keep the heat for 30-40 minutes.
In addition, they are all sweet ;-)