Dynarex Instant Hot and Cold Packs are designed to help offer quick relief to minor injuries, stiff joints, muscle aches, and cramps with a single hot or cold pack. The Packs are crafted from flexible materials to closely conform to body contours for effective treatment and added comfort. The Packs are activated by a simple squeeze for use in 30 seconds. The Dynarex Instant Hot and Cold Packs are conveniently sized for easy portable for first aid kits, sporting events, schools, and home use.  24/CS