polyester Zipper closure Machine Wash Please select the appropriate size according to the size chart. If you are not sure what size to choose, please contact us. Heating vests are designed with the latest carbon fiber and high-quality TPU heating sheet, which have better warmth retention.8 carbon fiber heating elements generating heat across the collar, waist, belly as well as upper back for core-body warmth. Fast heating within 30 to 50 seconds can save you time and make you warm quickly in winter. This fishing heated vest is made of high-quality nylon fabric, which is windproof and waterproof. Lightweight, skin-friendly interior have a soft, comfortable feel and provide better warmth. The lightweight vest could be hand or machine washable, put it to the lanuary bags, even after washing 50 times, it still remains intact. No longer limited to fixed batteries, this warm heated jacket equipped with a USB plug. 5v safe voltage, can be compatible with most power bank on the market.Note: The power bank is not include. Please keep it connected to a 5V 2A power bank when using it. The electric padded vest with stand-up collar can be matched with various clothes for all occasions. Perfect for outdoor activities, hunting, skiing, fishing, motorcycle, bicycle, camping, mountain climbing, outdoor attendance,office daily, etc.