We said it keeps them warm, don't expect your feet to boil. Otherwise, you would go for traditional hot water bottles or start moving if you have an issue.

During the winters, I had an issue with my feet getting excessively cold to the point where I couldn't sleep. This year, I decided to get this specific foot warmer, and it has been almost a month since I've had it. I can now say that it warms satisfactorily, not too hot but also not at all, it is a proper choice to pleasantly warm your feet.