You can use this ice pack any time, any place, anywhere. It is perfect for the immediate relief of all injuries. Ideal for when you're on the move or pitch side and don't have access to a freezer or ice. Instant Ice Packs are activated by squeezing an internal compartment within the pack. This starts a chemical reaction that instantly makes the pack cold. The Instant Ice Pack stays cold for 15 to 20 minutes, making it ideal for the early treatment of sports injuries.