The ZANIER Heat Technology is based on highly developed textile heat elements and a unique electronic control system. The robust lithium ion batteries which weigh just 120 g provide heat at three different levels for up to 20 hours. They are concealed in the extra long AVIATOR.GTX® cuff and you can hardly feel them. The gloves’ heating system is easy to operate with a single switch on the upper hand. The flame shaped LED light shows the chosen heating level (yellow, orange, red). The supplied USB charger unit recharges the batteries overnight. The gloves’ heating system is robust and even withstands hard knocks. The model can also be used without heating. Straps and Velcro fasteners were deliberately not used making them ideal for flying. Only top materials are generally used: the finest goatskin, 4-way stretch for comfort, soft, lightweight and warm PrimaLoft®, insulation; GORE-TEX® + Gore warm technology for dry hands; moisture-regulating ZA BREATH lining.