USED AS A COLD PACK Simply add ice and a little cold water for your perfect ice bag. Through restricting blood flow the icepack decreases swelling reduces muscle spasms and importantly reduces pain. 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.USED AS A HOT PACK For hot therapy just add some hot water (not boiling) to improve symptoms in conditions such as headaches/migraines menstrual pain/cramps spasms bursitis and stiff necks / backs.Superior Leak-resistant Cap with Large Cap Open (Allow for easy filling of ice cubes or crushed ice)FAST RELIEF The reusable ice bag is designed for people from all walks of life. Best choice for injuries and other boo boos. Ideal icepack for application of cold therapy to help reduce pain and swelling from minor scrapes headache bruises muscle aches allergy hangover sprains and strains. Recommended to help relieve pain reduce swelling speed recovery body treatment and personal care.No drips and No Leaks (Moisture is well sealed so now you can say goodbye to annoying leaky ice packs)Safe no allergy and waterproof and makes the water stay cold or hot much longer