About this Item 【Daily warmth】Heated undershirt material - face, inner layer and back: 100% polyester for warmth and durability. The inner layer of this heated down vest is made of aluminum-coated polyester - with a durable, water-resistant finish that shakes off light rain and snow, and is windproof. 【Practical Design Edition】 The adjustable drawstring at the internal waist position of the heated vest enhances the practicality of the design; the dual side zipper design allows for fine adjustment of the waist size; a dedicated internal battery pocket and two front pockets provide shelter for cold hands. With easy-to-adjust comfort and versatility, this Outdoor Jacket will keep the cold out when you need it. 【Keeps your core warm】This women's heated vest has 3 heating zones that generate heat on the sides of the back and abdomen to provide warmth to the core of the body.The 3 available temperature settings can be adjusted by simply adjusting the hidden internal buttons. Wear the heated undershirt over your favorite hoodie or long-sleeve t-shirt, or wear it under your shell to dial in the right amount of heat for the day. 【Included Battery Pack & Notes】 10000mAh capacity, 5V, heated undershirt power pack that heats up quickly in seconds and lasts 4 hours on high gear (red light), 6 hours on medium gear (blue light) and 8 hours on low gear (green light) when fully charged. When machine washing the warm undershirt, please make sure to put it in the laundry bag and take out the battery to avoid damage. 【New Warm Companion】 Button hidden heated undershirt, cut for everyday styling, is a versatile essential. The sleeveless vest design makes it perfect for everyday wear or easily slipping under a heavier winter coat on the coldest days of winter. This lightweight heated undershirt keeps your core warm and your arms free to face all occasions, hiking, trails or working outside, playing sports, or riding the gondola to and from the slopes on a cold, snowy day. Or on the ski slopes.