The first step is to get a tube sock and fill it with about 3 cups of rice and then stitch the top closed.
Fold down one short end of the flannel and stitch a hem.
Lay the flannel out, right side up. Fold down the end that has the hem about 4.5″ down.
Fold the other end up so that it overlaps the hemmed piece about 1.5″-2″. You might need to cut some off the end, you want the whole thing to be about 36-38″ long.This doesn’t need to be precise but you don’t want it extra long nor do you want it so small the tube sock doesn’t fit. Stitch along both sides.
Now the fun part. Put your hand into the tube, you should have a hole where the fabric overlapped, grab the end of the sock and begin pulling it into the tube. As you pull the tube down over the sock, the tube will turn right side out. This will take a little work as the rice tends to bunch up at the bottom, so just go slow and it will all work out.
You heat it in the microwave for 2-3 minutes to warm up and it will stay warm for a long time. It’s really good for when you have muscles aches and need a hot pack or when it’s cold and you want to snuggle under blankets. If you get really cold feet these are great for warming them up.
You can also use field corn – it will stay warm a little longer. We’ve used these for years and have never had a problem but I have read reports of people catching their microwave on fire by leaving them in too long. But you guys are smart so I know you would never do that.