MODULAR SYSTEM: Gerbing heated clothing can be powered in a multitude of configurations. For this reason all wire harnesses, controllers, battery packs and accessories are sold separately. FUNCTIONAL DESIGN: The jacket liner is design for a snug fit. If you are on the cusp of a size please order the next size up Suitable to be worn by riders, the jacket liner has a low profile elastic cuff for improved fit under the outer jacket. The heated apparel has a drop tailback for improved coverage while riding. MICROWIRE SYSTEM: Originally engineered for military use. Gerbing's Heating panels are the pinnacle of heating technology. The heated Jacket Liner features seven Microwire-powered heat zones – one on the collar, two on the chest, two on the sleeves and two at the back. These zones ensure even heating for ultimate comfort. The technology offers heat up to 135F. 12V POWER SYSTEM: Gerbing heated liner jacket can be plugged into the power source of a motorcycle, snowmobile, ATV, boat or airplane. It keeps you warm at any temperature or at any speed. BATTERY HARNESS COMPATIBLE: Gerbing heated clothing can be paired with single zone, dual zone and Bluetooth controllers. These controllers are sold separately. Gerbing is the original and most trusted brand of motorcycle heated clothing in the world. This Gerbing Heated Jacket Liner is no doubt the best heated jacket to keep you warm while riding your motorcycle or ATV. For over 40 years, Gerbing has been trusted to manufacture the highest quality heated clothing and offers a lifetime warranty on the performance of their patented Microwire™ Heating Elements. This 12V heated jacket liner is the perfect addition for any rider wanting complete comfort, regardless of the temperature. Built on a durable, wind-resistant nylon chassis, this liner comes with 7 Microwire-powered heat zones; collar (1), chest (2), sleeves (2), and back (2). It is designed to be worn as a mid-layer, under your protective jacket. The Microwire™ heat zones come to full temperature in seconds. The liner also serves as "home base" for Gerbing heated gloves, pants and sock connections.Features & Benefits:Jacket has seven Microwire heating zones: collar, chest (2), sleeves (2) and back (2).Pre-wired glove connections at end of sleevesLow profile elastic cuff for improved fit under jacketMini Ripstop nylon shellThermoGauge Bluetooth CompatibleDrop tail back for improved coverage while ridingGerbing 12V Jacket Liner Technical Specs:Power 12V DC 6.4 AmpMax Heat: 135° @ 77WPower 12V DC 6.4 AmpYKK zippersMaterial: Mini-rip shell, Taffeta liningAll Gerbing installations require a Battery Harness and Temperature Controller for operation (sold separately).Gerbing 12V Power System: Using our advanced interconnect system, Gerbing 12V garments plug right into your electrical system on your motorcycle, snowmobile, ATV, boat or airplane for an unlimited source of power and keeps you warm at any temperature, any speed. About Gerbing Microwire: The patented Gerbing Microwire system is the most durable and efficient heating platform ever developed. Products incorporating Microwire technology utilizes patented micro-sized stainless