specification: Item Type: Heating Scarf_x000D_Product Material: Wool_x000D_Product Size: Approx. (Flexible) 29 x 23cm / 11.4 x 9.1in (Manual Measurement Has an Error of 1-3cm / 0.4-1.2in) Features: 1Two in One: Heating scarf and hat for dual purpose, shrinking holes, can leak hair out to form a ponytail hat when you can bring it into the hat. 2Multi Styling: These beanies are designed with ponytail holes on the top of the hat, which are perfect for pulling out a messy bun or high ponytail. Equipped with a durable and elastic elastic band, it can adapt to any size or style of hair. 3Heating Element: It can be distributed around the neck and head for heating, keeping your neck and head warm, and the usb line can be separated without using electric heating, and the product material can also keep the part warm. 4Applicability: Suitable for daily and travel, skiing, biking, hiking, camping, mountaineering, skiing, etc. 5Stretchable: Regardless of head size or hairstyle, this warm hat will stretch to fit you. You can even cover your ears. PackageList: 1 x Bib 1 x Usb Line