With Elastic Velcro Strap, easy to useSuitable for both cold and hot therapy (Accept temperature:-20~80°C)Remains soft and flexible after freezing, even in temperatures as low as -20°CRetains heat or coolness for a minimum of 45-60 minutes.Certificate:ISO9001/ISO13485/CE/GMPReusable Outer Material : PVCContents : Pearl type gel, with Elastic Velcro StrapSize : 12 X 18 cmColor : Blue pearlMade In Taiwan Cold Therapy: Place the pack in a freezer for at least 15-20 minutes before each use. Hot Therapy: Hot Water 1. Place the pack in hot water (max 80℃) for 15-20 minutes. 2. Remove and wrap the pack in a dry towel. 3. Apply to affected area. Microwave oven 1. Place the pack in a microwave oven (recommend 1,000W) 2. Ensure that the gel is evenly distributed in the pack. 3. Heat the pack for 60 seconds at a low power setting. Heating times will vary with the power of the microwave. 4. If more heat is required, heat in additional 10-second increments until the desired temperature is reached. 5. Allow the pack to rest at least 1 minute before application.