Comfortable Temperature Maintenance: Made with PCM material that naturally solidifies at 28°C and is designed to maintain a comfortable body temperature between 22°C and 28°C. This makes it easy to maintain a consistently comfortable temperature. Reusable: High-quality materials allow for sustained cooling effects even after repeated use. Versatile: Lightweight and thin, it can be used in various situations such as outdoor activities, sports, work, and daily life. Easy Maintenance: Simply cool it in the refrigerator and it's ready to use, requiring no special preparation. No charging is needed. Purchased this summer. Unused. ICEMAN PCM Vest Cold Armor Cooling Vest Unisex PCM Material No Charging Required Reusable Cold Retention Heatstroke Prevention