1. Prepare an old sweater, scissors, sewing machine, and needles.
2-3. Cut the two sleeves of the sweater off, whatever length is desired.
4. Cut a half-inch hole on the side of the sleeves.
5. Get 10 inches yarn from the sweater.
6. Hand sew the edges to secure from the fray.
7. Fold the edge of the other side of the hand warmer and sew them together for a nice edge, and you're done!