Instant ice packs are disposable products. For pain relief apply cold immediately after an injury to reduce the blood flow to the injury and combat swelling. Chemically activated cooling ideal for aches and sprains can be used on sporting injuries etc. Instant ice on the spot, when and where you need it! Instant cold pack for immediate and effective cooling. Quick-freezing ammonium nitrate and water formula; Single use Packs easily for emergency use on injuries; Can also keep food cold for hours Just squeeze and shake, and it's ready to use