【Large Diameter and Leak-Proof Design】The ice bag has a wide 5cm opening for easy ice insertion! Even large ice cubes can be inserted without any problems. The lid is well-designed to prevent leaks, so you don't have to worry about spills. It alleviates pain through icing and reduces swelling caused by inflammation. The design minimizes gaps between the water inlet and the lid, and with soft rubber and tight sealing, there's no need to worry about leaks even during intense sports. 【Latest High-Tech Adoption】Condensation and water droplets are less likely to form due to the moisture-proof processing. The back of the ice bag is coated with high-quality polyurethane, preventing condensation. The cap uses a silicone ring, ensuring no leaks, making it enjoyable to use. 【How to Use the Ice Bag】1. Fill the ice bag with 1/3 ice and 1/3 water. (Do not use water with sharp edges) 2. Remove the air from the ice bag and close the lid tightly. 3. If necessary, you can replace it with a spray head. 4. Apply it to the area you want to cool. 【Works in Various Situations】1. Emergency treatment can be performed by putting ice and water in it. 2. Cool down after playing sports such as baseball, soccer, and golf. 3. Can be used as a heatstroke and sunburn prevention measure. 【Icing and Heating Function】Not only for icing, but also a cold and hot ice bag that supports up to 50 degrees Celsius, so it can be used for chronic pain or when warming a cold affected area. It is also recommended for relaxing stiff muscles. Relieves body fatigue and pain. Icing relieves muscle pain and suppresses swelling caused by inflammation. Suitable for sudden fever, headaches, toothaches, and heatstroke. Relieves menstrual pain in women.