Yes, we use old baby socks that have seen their day.

We use old socks for adults, another way. We put long grain rice in until the sock is about 2/3 full and tie it with non-metallic string, like twine. Then we heat it in the microwave until it is hot but not hot enough to burn the skin. Then we use it as a hot pack on sore muscles and joints. it works wonders to relieve the pain. You can use it over and over again without refilling the rice. We’ve used some for about five years, so far.