content: I love Bodysense products.They stay hot for a long time. I use them in my massage practice as hot packs. The smell is great and it lasts quite awhile. The only thing is as large as it is you need a big microwave to heat it. I wind up folding it then it stops roatating so I have to stop and adjust it. UGH it is a pain. Haven't figured out how to arrange so it heats evenly. Otherwise I love it.