Good alternative to "heat patch"

A good alternative to heat-giving Rückenplastern that are 1 to 2 warm and irritate the skin. The kidney or better back warmer can be set individually via straps. The bands do not interfere in his sleep. The seat is secured using Velcro, which ensures a good and stable bond. I prefer the bright side on the skin. No sweat, it produces a heat which is very pleasant. "Overheating" guaranteed excluded. A really useful article that I should have been for sale previously. The heating patches from the drugstore will I dispose of as too aggressive and harmful in the long term for the skin. Highly recommended and also inexpensive!