I am recovering from a partial knee replacement and was give some sort of knee cuff cooling system that need to be put around the knee. You need to make sure you fill it with ice and it only cools for about 10 mins and you are left with the cuff that gets in the way. I then tried frozen peas which worked much better, but the problem is that you have to keep your knee still, otherwise the peas fall off. My husband then remembered that I used Physicool for my foot once and a big lightbulb went off above my head and was very annoyed that I didn't think of this 4 weeks ago. I went on the website and ordered Physicool for knee recovery. It cools for about 2 hours, but the good thing is that you can walk around whilst cooling it. Also peas only cool on the top, but now my whole knee is icing. It is a shame that hospitals do not tell people that this is available. The ice cuff in the hospital cost met £25 and unless I ever get a problem with my knee again, that is wasted money. This pack cost me £49, but I can use it on any sprain all over the body and for many years to come and it is easily tucked away in a cabinet. As it was not clear when I ordered what the delivery time was, I called and they said they would warehouse it immediately, so I had it the day after. Because shipment was mentioned, I thought it would have to be brought in from outside the UK and that made me a bit nervous.