The HT Heat Tech Vest features Alpinestars Heat Tech System which distributes perfectly balanced warmth in the coldest of conditions. The smart system has a double system for optimum performance in cold weather; a manual control via an LED button with three pre-set heat settings AND an automatic heating control system. The automatic heating control system has a temperature sensor embedded inside the vest to continuously check the rider’s temperature in order to provide and maintain the pre-set heating temperature for supreme riding comfort. Smartphone Alpinestars Heat Tech App (as used on Alpinestars Heat Tech gloves) for turning the vest ON/OFF and to precisely set and control the internal temperature via a Bluetooth® connection. Dual power: the vest can be plugged to the bike battery or used with the high performance 12v Lithium Battery (included with the vest) for reliable, long-lasting power to the Alpinestars Heat Tech System. The Alpinestars Heat Tech System consists of superior graphene heating elements that ensure greater efficiency and heat distribution as well as being more breathable, flexible, and robust in the long run. The four heating elements are strategically positioned on the chest, lower back, and neck for optimal heating performance. The vest is constructed from a blend of soft materials (Polyester/Stretch) optimized for enhanced rider comfort. The front closure is achieved by an asymmetrical, angled zipper to prevent the material from excessively bunching up when worn under other layers. The vest is equipped with a pocket on the lower right side to securely store the battery. A visible button on the lower right side activates the heating system. Internal soft brushed mesh inserts cover the graphene heating elements for improved rider comfort. The back is extended for greater coverage and protection from the elements in riding positions. Reflective prints on the back and front.