Thank you for viewing! ❤️ Price negotiations are welcome! ⭐️ First come, first served! ⭐️ Initial defect guarantee included! ※ Size L: Inner diameter approximately 130mm ※ This ice neck cooler uses PCM material researched and developed by NASA (National Aeronautics and Space Administration) in the United States. It freezes below 25°C and melts above 27°C, providing a longer-lasting cooling sensation. ※ Unlike ice, this ice neck cooler, Smart Eco Ice, prevents overcooling and maintains a comfortable temperature for approximately 90-150 minutes! You don't have to worry about low-temperature burns, making it safe for children to use. ※ The carotid artery is located in the neck. Cooling this area can cool the blood flowing throughout the body, effectively cooling the entire body and preventing heatstroke. ※ Place the neck cooler in the freezer, refrigerator, or ice water for 10-30 minutes, then take it out, wipe off any surface moisture, and wear it around your neck (Note: Freezing time varies depending on the temperature). It can be used repeatedly and semi-permanently. ❤️ I have many other wonderful products for sale too! ↓ Further discounts are available for bulk purchases (^o^) ↓ #Ram'sShop Management Number: 518-$$580