I've made several after buying one and then realizing how easy it would be to make! The one I bought had some herbs and maybe some lavender in it, which smelled pretty bad when they scorched in the microwave. I just use rice. I always make a bag of rice (sewn shut triple on all sides) and then a pretty "pillowcase" out of flannel or fleece to put it in AFTER heating for softness. Never would have survived wrist surgery healing without mine!