Portwest Hi Vis Ultrasonic Heated Tunnel Jacket S548 The Hi-Vis Ultrasonic Heated Tunnel Jacket offers the best in high visibility standards and insulation properties. Carbon fibre heated panels are embedded into this padded jacket to bring extra warmth and comfort to the wearer. The use of innovative heat sealed baffle fabric increases its water resistance. This jacket also has three heat settings controlled by a button at the chest and includes a rechargeable battery that offers 3-10 hours of heat. This package also includes a Dewalt 18v XR USB Battery Adaptor with 2 USB Outputs so you can use your Dewalt 18v XR batteries to keep you warmer on site for longer Product Features Premium water resistant fabric Heat sealed seams for increased water and wind resistance Battery powered.