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 60 g provide heat at three different levels for up to ten hours. They are concealed in the HEAT.ZX 3.0 cuff and you can hardly feel them. The gloves’ heating system is easy to operate with a single switch on the battery. The flame shaped light shows the chosen heating level (yellow, orange, red) and shines through the perforated upper material. 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. Only top materials are generally used: the finest goatskin, 4-way stretch for comfort; soft, lightweight and warm ZA LOFT insulation; ZA TEX membrane for dry hands; leash.