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[Naturally freezes below 28°C and does not condense] Even in the hot summer season, this neck ring is a cooling item for your neck! This neck cooler for your neck is made of "PCM material," a special ice that freezes in environments below 28°C. It efficiently cools the carotid artery in your neck at a comfortable temperature, making it recommended for heatstroke prevention! It doesn't get too cold like ice, so there's no worry of frostbite and it's gentle on your skin. It doesn't condense over time, so you don't have to worry about water droplets wetting your clothes! Use two ice neck rings alternately for a much cooler experience! [Prevent heatstroke by cooling your neck] The design fits snugly around your neck and is difficult to fall off. This cool neck ring can be worn simply by placing it around your neck. It keeps your neck cool and refreshing. Its slim design doesn't get in the way even when worn around your neck. Your neck has a major artery, and cooling this area can cool the blood flowing throughout your body, effectively cooling your entire body and helping to prevent heatstroke. [Reusable and no charging required] Even if it melts, it will freeze again and can be reused by simply placing it in a cool, air-conditioned space! It freezes even faster when placed in a freezer or immersed in tap water, so it's ready for sudden outings. Cooling duration: 15-20 minutes in a freezer or refrigerator, about 20-30 minutes in ice water or cold water! It can be used for 60-120 minutes based on an ambient temperature of 25-40°C. It's also great for short outings and as an outdoor cooler! [Wide range of uses - Unisex for adults and children] This neck ring is useful in various situations, including business, commuting, fishing, fireworks festivals, stuffy nights, cycling, golf, basketball, gardening, watching sports, outdoor activities, and workplaces. Since it naturally freezes below 28°C, it is suitable for those who are sensitive to excessive cold and can be used widely. As a summer cooling item, it would surely be appreciated as a gift for family and friends. [Size] [L Size] Inner diameter approx. 11cm / Thickness approx. φ2cm / Inner circumference approx. 36cm Weight: 140g [M Size] Inner diameter approx. 10.5cm / Thickness approx. φ2cm / Inner circumference approx. 34cm Weight: 130g [S Size] Inner diameter approx. 9cm / Thickness approx. φ2cm / Inner circumference approx. 30cm Weight: 130g [Warranty] Thank you for considering and purchasing our product. If you receive a defective item due to shipping or other reasons, please