I have one I bought at a church craft fair and was I glad I did as my eye doctor said I had dry eye. She told me to go home heat it for a minute wrap it with plastic wrap then and warm wet wash cloth put it on my eye for 10 -20 minutes. This would help open up my tear ducts so eyes would make more tears. It's made of white cotton with a flannel cover you can remove for washing and rice in side. I've also used it for sore muscles.