[Nano-graphene "heat" technology] Graphene is known as the "small human sun" that releases the light of life, which can quickly generate heat within 5 seconds and release the far-infrared life light waves suitable for human health. [Function] It can improve the blood circulation under the skin, relieve pain, and be beneficial to human health without side effects. Light weight and no burden. [3 levels of precise temperature control and timing power off are safer] Built-in thermostat chip, you can freely select 3 different temperatures, and automatically power off within 2 hours, ensuring safety. [Selected down material to give you a warm winter] The outer layer is made of down fabric fabric, high-density windproof and thermal storage, inner silk cotton filling, light and thin warmth, lock temperature and cold. [Zipper storage design is more convenient to travel] The hidden storage bag is equipped with a zipper design, which can store small objects such as mobile phones, making it more convenient to warm your hands and travel.