Horse Pilot Mens Sleeveless Down Jacket E Kelvin BordeauxThe E Kelvin sleeveless down jacket is made from a lightweight, ripstop fabric for enhanced abrasion resistance Featuring integrated self heating technology built into the lining and powered by a rechargeable external battery, this carbon nanotube textile panel delivers warmth precisely where the rider needs it The technology is activated via a button on the side of the jacket. Temperature can be adjusted on the button or through the "iwarm3" app,