The Harkila Heat Waistcoat is a unique vest designed with practicality and comfort in mind. This modern shooting vest is lined with a built-in heating membrane which can be set to the exact temperature you require - all via an app on your smartphone! This lightweight vest has stretch side panels for comfort and a heat reflective lining preventing heat loss, and also enhancing the heating membranes capabilities. The button on the chest allows you to set the temperature to 1 or 3 presets, so you\'re not dependent on your phone. The waistcoat is fully machine washable and comes supplied with a drybag to pack it away into.Heat Waistcoat FeaturesHarkila Heat waistcoatIn-built heating technologyStretch side panelsElasticated armhole and bottom hemStow pocket for powerbankLarge heat padsDouble heat panelsZipped chest pocketSide zip pockets80g paddingMain Fabric: 100% Polyester, 20 Denier Poly Knit, WR, Polyurethane-CoatingLining: 100% Polyester, 20 Denier Poly Knit, Heat Reflecting Silver PrintThere are heating membranes sewn in into the vest and using the associated smartphone app, these 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. Unlike older heating technologies on the market, the heating membranes in the Harkila Heat Waistcoat are flexible enough to be folded up and packed away with the garment they are sewn into. The waistcoat can also be safely machine-washed. In the right-hand pocket of the waistcoat is a waterproof USB plug, so you can connect a power bank of your choice. With a power bank of 10,000mAh, the waistcoat can output its highest temperature of 52C for about 7 hours at an outdoor temperature of 0C. Once the waistcoat has reached the set temperature, the heat membranes automatically go into standby to save energy. They then turn back on automatically if the temperature falls 1-2 degrees below the level set for the waistcoat. The result is that the waistcoat is heat-regulating because the heating membranes automatically turn off if you get hot from exertion and turn back on when you are sitting or standing still.Please note the power bank is not included.Harkila\'s Ref.MPN: 120111725Colour: Willow Green / BlackSizes: Medium, Large, XL, XXLPM Ref: 1110965