Pro Ice cold therapy pro model knee wrap provides pain relief and stability to the knee. But sometimes, at a game or on the job, even more pain relief is needed. An additional ice insert (PI 421) can double the icing time of the knee wrap (PI 420). Simply remove one ice insert and replace with the additional one for extended pain relief, making it the ultimate ice wrap. This offers flexibility and cost-effectiveness. Yet another hallmark of Pro Ice's ability to outperform any instant cold pack or reusable cold pack on the market today..