The C100 Disposable Instant Cold Packs are essential for immediate first aid and emergency treatment of sprains, strains, and minor injuries. These compact 5" x 5" packs provide instant therapeutic cold without the need for refrigeration. By simply squeezing the pack to rupture the inner bubble, a chemical reaction is triggered that drops the temperature of the pack instantly. These are ideal for athletic bags, school clinics, and emergency response kits where traditional ice is unavailable.