This heated vest is made of 100% polyester, which is soft, comfortable, and warm. It has a heating function that uses hydroelectric heating technology, which can quickly warm the vest in a short time. The vest has a built-in rechargeable battery with a capacity of 5V/2A 10000mAh, which can be charged by USB. The heating vest has three heating modes: high heat, medium heat, and low heat. The vest has a slim fit design, which is suitable for various outdoor activities such as skiing, cycling, hiking, and camping. It is also easy to clean and machine washable.