Thank you for viewing! ☆*。. ◆ Brand new, unused・:* ◆ Same-day shipping! ◆ Immediate purchase is welcome Product Details ● Size S (Recommended for children) 　Inner diameter: Approximately 10.5cm 　Inner circumference: Approximately 33cm ● For adults Inner diameter: Approximately 19.6cm 　Inner circumference: Approximately 15.5cm ※ Please note that there may be errors depending on the measurement method. ⚠️ The adult size has been opened for photography. ✅ 【No power required! Naturally freezes below 28℃】 Using a special PCM material, it freezes naturally below 28℃. No batteries or power are needed, just cool it in the refrigerator or cold water, and the coolness returns immediately. It's a convenient cooling item that can be used anywhere. ✅ 【Reusable, eco-friendly & economical】 It can be reused many times, so unlike disposable products, it's friendly to the environment and your wallet! It can be used many times during the summer, making it a great value. It's an eco-friendly item that the whole family can use with peace of mind. ✅ 【No condensation, so your clothes won't get wet】 Unlike ice or cooling packs, there is no condensation (water droplets). You don't have to worry about your clothes or skin getting wet, so you can use it comfortably while commuting or studying. ✅ 【Cools the neck to prevent heatstroke】 It's effective in preventing heatstroke by efficiently cooling the neck, which is important for body temperature regulation. It protects your body in various situations, such as when going out, working, or playing sports. ✅ 【Not too cold, safe for children and people who feel cold】 It's not too cold, just the right coolness, so it can be used safely by people who feel cold, children, and the elderly. It supports a comfortable summer with a pleasant temperature. ✅ 【Lightweight & compact, easy to carry】 The lightweight and compact design is perfect for going out, traveling, and commuting. It doesn't take up much space in your bag, and you can take it out and use it immediately when you need it. ✅ 【Quiet cooling without noise, keeps a comfortable space】 Unlike fans and electric coolers, it doesn't make any noise, so you can use it without hesitation in quiet places such as while studying, in the office, or in the library. You can enjoy your own coolness without worrying about those around you. ✅ 【Not just for summer! Active in various situations throughout the year】 It's a versatile item that can be used not only for summer heat measures but also for indoor work, cooking, and cooling down after sports, and can be used in spring, autumn, and indoors. It will be active throughout the year. I have many other items for sale ✿ Product list 　 ↓ #mari☻mari shop 1-15.2-55