Works well and water stays warm a long time!
I use this every night to put on my legs and feet to keep the cramps at a minimum, as well as the achy feeling after being on them all day.  I like the fact it comes with a cover so I dont have to use a towel. It is easier to take off than I thought it would be. Fold the bottle and just wiggle it off when you need to wash it. Don't dry it in the dryer.
Rating: 5 stars