Polyester fiberHOME USE OR SPORTS: Ice Packs for injuries are daily necessities at our homes, especially for sports people, it reduces various types of pain immediately for easier life.COLD TREATMENT: Ice bags for injuries is good for headache, migraines, toothache, muscle spasm, toothaches, joint pains, swelling, sores, etc. The Ice bag could last cold for at least 4 hours, if you add alcohol with Ice cube, more cool time is served.HOT TREATMENT: Hot packs is good for menstrual pain, arthritis, back pain, etc. Notice: The temperature for hot water therapy is 50-60/122-140.GET RELIEF ANY WHERE FOR ANYBODY: 3 different sized reusable ice bags (11", 9", 6") and 1 elastic wrap. 6" for Children/ small part of body (Eye, Neck, Ankle, Elbow etc.), 9" for Teenagers and Adult / middle part of Body (Teeth, Knees, Head etc.), while 11" for Adults big part of body (back, shoulder etc.).NO LEAK AND SKIN FRIENDLY FABRIC: Good quality for materials, no water leak during use, and the soft fabric is skin friendly care.