Ice packs are portable, flexible bags filled with a gel or liquid that can be frozen to provide cold therapy. They are commonly used to reduce swelling, relieve pain, and treat injuries such as sprains or strains. Ice packs can be applied directly to the skin, but it is advisable to use a cloth barrier to prevent frostbite. These packs come in various shapes and sizes, making them suitable for different body parts. Some ice packs are designed to conform to specific areas, like the knee or shoulder, while others are larger for broader applications. They are a convenient tool for both home care and sports injuries.