17 HEATING ZONES: The heating vest is professionally designed with built-in high-quality carbon nanofiber heating elements, breaking the traditional 5 heating zones, our 2022 updated heated vest has 9 heating zones covers for 9 cores body parts, such as neck, back, abdomen and waist, generate consistent heat, helps to keep the body warm and promote blood circulation. In order to choose the right size, please double check the size chart in the picture (2nd picture).If you are afraid that the size may be smaller, please choose One-Size larger. 3-LEVELS TEMPERATURE CONTROL AND CONVENIENT HEATING: This heated vest has 3 levels for you to adjust the temperature. You can adjust the temperature by simply pressing a button on the heating jacket. High level: Red color (45-50/113-122); Medium level: White color (35-45/95-113); Lower level: Blue color (30-35/86-95). The electric heating vest is compatible with any power bank with 5V 2A/2.1A USB output port, just connect the USB cord of the heating vest to your power bank and you are ready to use (Note: No Included Power Bank) COTTON Machine Wash Fastening: Zipper SUITABLE FOR OUTDOOR ACTIVITIES: This heating vest is perfect for outdoor activities such as camping, skiing, snowmobiling, mountain, motorcycle, hunting, hiking, dog walking, fishing or office daily and business. The front and back outer fabrics are waterproof and windproof, and the left and right sides are made of elastic fabrics, which are more user-friendly and comfortable to the skin. Suitable for use in autumn and winter HAND WASH AND MACHINE WASHABLE: This heating vest is hand washable as well as machine washable. Before washing, please remove the power bank and zip the pocket. Place the vest in a laundry bag to machine wash. Please do not wring out PERFECT GIFT: This heating vest, with a lightweight design, easy to carry, strong warmth and protection against cold attack, is suitable for young/old/men/women. This heated jacket comes in a gift box, perfect for giving to parents, family, friends. It would be a great gift for Thanksgiving and Christmas coming up. In order to choose the right size, please double check the size chart in the picture