How do you make a heating pad?

Well, Making a heating pad like the electric ones would be tricky, but there is another way.

First, sew a pocket of fabric, but leave a small opening. Then through the opening fill it with rice to desired fullness. Sew it up the rest of the way. Put it in the microwave to heat it. Easy, but it works.

Make small ones for inside mittens, or big ones to ease soreness.