Pin two pieces of fabric together, wrong side out.
Use sewing machine to sew around the edges, leaving at least an inch opening.
Turn square right side out.
Fill square ¾ of the way with rice (I used a small funnel).
Either hand sew or machine stitch the inch opening closed.
To use the hand warmers, place them in the microwave for 25-30 seconds. Let them cool for a minute, then pop them in your pockets before you head out the door.
Recipe by Saving Cent by Cent at https://savingcentbycent.com/2017/12/08/diy-hand-warmers/