Simply fill with ice and water to relieve discomfort from headaches, bruises, migraines, muscle aches and swelling. For heat therapy, add hot water (not boiling) to help soothe an upset stomach, migraine, sinus and joint pain. hot therapy can be used for muscle pain and spasms, sprain, strain and stiffness etc. Very useful product for Adults, sportsperson, Kids (Instant Pain Reliever With Vintage Technology). High-quality, Allergy-free Material, Economical, light weight, reusable & children friendly.