Härkila’s innovative HEAT technology uses a thin heating membrane to warm your body safely and effectively for maximum comfort and performance. Powered by your powerbank in the pocket, you control it either by the button on your garment or via the HEAT Control app on your smartphone

Using the associated smartphone app, the heating membranes can be set to the desired temperature between 30C and 52C. The membranes can also be set to 38C, 46C or 52C using the push button on the chest, so you are not dependent on your smartphone.