Multipurpose. Used for cold or hot therapy cold therapy can be used for headache toothache sprain bruises bumps and other sports injuries while hot therapy can be used for muscle pain & spasms sprain strain & stiffness etc Easy to use. For cold therapy simply fill with ice cubes and a little water to relieve discomfort. For hot therapy just add some hot water (not boiling) and apply to the needed areas. Quality and Safety. Thanks to the leak-proof lock worry no longer about spilling water out dripping and wet cloth. English style ice bag cold compresses are made of waterproof rubberized fabric with a plastic screw cap to securely keep the ice and melt water inside the bag. Bags are made of heavy duty material and are reusable. FAST RELIEF ANYTIME ANYWHERE - Keep one handy ice bag in your work desk car and home for grab-and-go comfort from pain. Whether you are experiencing the weekend hangover headache or aching and soreness from a recent visit to your chiropractor get the soothing relief from hot or cold therapy right away.