The slippers are nice to look at, but not really much suck. The grains should better be sewn into chambers, because if I lift the shoes, slip the grains to one side. Which is then maybe warm, but the rest of the foot remains cold. The heat also does not last very long, so after 20 minutes these things have cooled down again. Mine were already torn the next day at one point, and the linseed trickled out. Conclusion: is a gag, fortunately not very expensive. But for my cold feet I prefer to continue a hot water bottle. The keeps warm longer and is much cheaper !!!