The Back On Track ""Katla"" Heated Puffer Vest is your go-to solution for instant warmth without the bulk. Perfect for riders of all levels, this vest combines functionality with a sleek, close-to-body fit, allowing for maximum comfort and freedom of movement during outdoor activities or while taking a break between training sessions.Incorporated electrical heating system with three adjustable heat settings: Low (45° C.), Medium (50° C.), High (55° C.)Lined with Welltex®fabric to reflect infrared energy for enhanced warmthLightweight design ensures comfort without restricting movementConvenient zipped pockets at the front for secure storagePowered by a 5V USB power bank or 7.4V battery (power bank not included) How to use it: Connect the USB/DC power, press and hold the LED controller for three seconds to turn on, and cycle through the heating settings with a simple press. Enjoy the warmth wherever your ride takes you.