· Relieve pain or swelling the natural way with a Hot and Cold Compress Reusable Microwave Gel Pack · To get the desired cold compress temperature, just store the Hot and Cold Compress Reusable Microwave Gel in the freezer for at least an hour to freeze the gel · Cold compresses are usually needed for reducing swelling, toothache, temporary relief of headache, and reducing fevers · To heat the Hot and Cold Compress Reusable Microwave Gel Pack, just pop it in the microwave for 30 seconds if it s room temperature or 1 minute if it s frozen · You can also use boiling water to heat the Hot and Cold Compress Reusable Microwave Gel Pack if a microwave isn t available by immersing it in boiling water that s no longer directly on top of a stove · Hot compress is ideal for temporary relief of muscle aches and pains, back pain, sinusitis and menstrual cramps Safe, non-toxic, reusable, leak proof, durable Tested to store breastmilk up to 14 hours when used with Cooler Bag / Cooler Box