Flexible, Reusable & Long- lasting Ice Packs for Knee. The unique filling material has a much lower ice point at -13℉, allows the ice packs stay smooth and pliable to match up the knee cap when frozen, even 30% more volume than others, so to stay colder for better alleviating pain around muscles, joints, and tendons on your knee. Cold therapy is proven that has powerful and efficient help with arthritis, patella issues, meniscus injuries, chronic knee pain, sprains, sports injuries, and more.