Not Edible Product No Refrigerator Needed - Simply chill the neck cooling tube any space that is cooler than 82.4°F for 20 min to activate the cooling effect Reusable Body Cooling Product - Cooling effect continues for 90-120 min. When the effect diminishes, just re-cool it for reuse, making it a sustainable cooling solution Soft & Comfortable & Durable - The outer TPU material is soft and not easy to be tore off. It's designed to fit comfortably around the neck (Inner circumference of 15.7 inch) with a light weight of 165g Eco-friendly Material - Filled with an eco-friendly phase change material (PCM) Ideal For Both Indoors & Outdoors - Provide cooling relief with all kind of scenarios such as WFH, cooking, workouts, hiking, camping, BBQ, etc.