And there are three, you can alternate them as soon as one is not hot enough.
They are well made, nice to heat in hot water and so fulfill the intended purpose of me.
The cold function I have not tried yet, but I think that they just can use it as those you get for the hospital. Definitely better than the quadrangular ice packs which are used for insulated bags.
So cool or warm compresses to the joints are super.
