It liquefies when it exceeds 48°C and solidifies when it drops below 48°C, so it can be used repeatedly by warming it up. 【Product Information】 ■Material: External TPU, internal PCM, cover polyester ■Weight: (M) Approximately 150g ■Color: Purple ■Size: Inner diameter (M) Approximately 11cm ●POINT 1 Solidifies naturally below 48°C A neck ring for the neck wrapped in a durable TPU material containing "PCM," a water-soluble gel that solidifies below 48°C. ●POINT 2 Moderate warmth lasts Maintains 48°C, and with a moderate heating temperature, there's no risk of burns! It warms comfortably. Usage time: Approximately 90 minutes to 120 minutes ●POINT 3 Reusable many times It liquefies when it exceeds 48°C and solidifies when it drops below 48°C, so it can be used repeatedly by warming it up. ●POINT 4 Soft to the touch with a fur cover. The warm, fluffy, and smooth-touch fur cover feels great. It features a soft texture. ●POINT 5 No power or batteries required No power or batteries are needed, making it an economical and eco-friendly cold weather solution. Great for various scenes: At home, outdoors, camping, commuting to school, sports, etc... It can be used repeatedly for cold weather対策 in various scenes, making it convenient and eco-friendly. Related keyword search: Sports, business, leisure, commuting, school, home, outdoor, economical, no batteries required, reusable, convenient, eco-friendly, stylish, comfortable, children, kids, men, women, elderly, Christmas present, neck, warm, heating, warmth, cold protection ring, warm ring, warms in 30 seconds, cold対策, warm goods, neck warmer, hot ring, cold protection goods, washable, warm ring