CVS pharmacy now sells PEAS hot and cold therapy packs that you can not only put in freezer BUT also the microwave. I was very skeptical but apparently this is a new, improved version. It comes with a belt with which you can attach to the velcroe on the bubble filled product. It's AMAZING how it holds the heat much longer than the rice sock.....at least for 2 hrs. This morning I attached the belt and wore it around my waist and found I can wear it under my clothes without it showing. I'm suffering right now from TMJ and my neck troubles and I can sleep with this easily next to my pillow because it's lightweight and thin. I drop it into a knee high (cut a hole at one end to pull the tab thru) and yesterday I also wet a washcloth to wear next to my neck, under the heated PEAS......this makes moist heat. I'm heading to CVS this morning to purchase a couple more.