Thank you for viewing. Adult cool neck ring that cools naturally at 28°C. Cooling lasts approximately 60 to 120 minutes (When the outside temperature is 25-36°C. Varies depending on body temperature and environment.) - Product name: Cool Neck Ring - Size: Adult size (inner circumference 34.5cm) - Temperature: Cools naturally at 28°C - How to use: Cool with cold water or ice before use - Cooling time: Lasts approximately 60-120 minutes Although it is new and unused, it has been stored at home, so please purchase only if you understand this.