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 soothe injuries such as sprains or strains. Ice packs can be applied directly to the skin, but it is recommended to use a cloth barrier to prevent frostbite. These packs come in various sizes and shapes, making them suitable for different body parts. Some ice packs are designed to stay cold for extended periods, while others are meant for quick use. They are often found in first aid kits and are popular among athletes and individuals recovering from surgery.