The pack when heated usually stays hot about 30 minutes (I prefer the hot on these areas better than the cold and where it does
Okay I know this says it is a Knee Gel pack but I have been using it for my shoulder and back and neck area. I have a torn rotary cuff they did not heal right and suffer from chronic pain in these areas and sometimes I can not always take a heating pad every where I go. The Abco gel pack can travel with me and I can put it in the freezer at work or microwave to heat it up when I need some relief. The pack stays flexible after freezing so I can bend it around my shoulder and neck area and stays cold for around a hour and a half. The pack when heated usually stays hot about 30 minutes (I prefer the hot on these areas better than the cold and where it does not stay HOT as long as the cold that is why I gave it 4 stars instead of 5). The pack is well made and seems to be doubled layered as the description said and does help with ached and pains. Again I have not used this on my knee so I can not say how it works there but as for the rest that I mentioned it does a great job!
Rating: 4 stars