Symtec offers the best Hand Warmer Kits on the market. The original idea for the hand warmers came from Symtec engineers to address the need to keep the hands warm while riding in cold temperatures. Symtec's hand warmer are used for Harley Davidson and Metric Motorcycle models. Because the hand is exposed to the cold air when pressing the throttle it can get very uncomfortable when riding in cold weather. However, Symtec Hand Warmers will keep your hands warm in even the coldest temperatures. These are a great, must have accessory - 2 stage heated grips keep you comfortable and warm. Riding with these really do extend your riding season! Superb quality made grip heater kit.