3 SIZE DESIGN FOR DIFFERENT REQUIREMENTS Small 6 and medium 9 for children and teens, large 11 for adults. Comes with a compress wrap would help to hold the ice bags, being more stable and versatile support full body. A must-have product for sport injuries, pain relief, muscle aches and first-aid etc. EASY TO USE AS HOT & COLD THERAPY For cold therapy, simply fill the ice bag two third full with ice and water to relieve discomfort from headaches, bruises, migraines, muscle aches and swelling. For heat therapy, add hot water (not boiling, Notice: The temperature for hot water therapy is 50-60/122-140.) to help soothe an upset stomach, migraine, sinus and joint pain. INSTANT PAIN RELIEF - The ice bag packs are ideal for application of cold therapy to help reduce pain and swelling from minor scrapes, bruises, muscle aches, sprains and strains; Suitable for sport injury and first aid. Recommended to help relieve pain, reduce swelling, and speed recovery. SAFE & WATERPROOF Superior Leak-resistant Cap with Large Cap Opening allows for easy filling of ice cubes or crushed ice. Soft, waterproof and flexible textile enables the water to stay cold and hot much longer than gel packs or other packs. LIGHTWEIGHT & PORTABLE FOR DAILY USE 9 ice pack just weight 3.5 Oz, great to keep one in your car, work desk, home and travel bag for instant pain relief. Whether you are experiencing the weekend hangover, headache or aching and soreness from a recent visit to your chiropractor, get the soothing relief from hot or cold therapy right away.