These corn bags can be used hot or cold. They are made for the microwave with all cotton materials. Simply heat the corn bag for 60 seconds in the microwave. It will stay hot, uncovered for 20-30 minutes. Heat before bedtime, toss in the bottom of your sheets, brush your teeth, come back and your feet will stay warm.
Or keep one in the freezer for bumps, or keeping your lunch cool.
Corn bag comes with use instructions.
Each bag is a unique size, shape, and overall fill amount.