Love it!
It can be so hard to effectively apply cold to aching back muscles. Ice can be wet and too bulky. Ic epacks present the same problem of bulkiness. AND, If you move while lying down the cold pack will need to be adjusted causing more distress to the injured person. This cold pack stays located on the injury area whether one is in a prone position, walking around, or going to the freezer to get another cold pack, etc. etc.  We bought two (of different brands) so there will always be a frozen one to rotate.
Rating: 5 stars