To stay warm in cold conditions, add a Synergy Vest to keep your upper torso comfortable. Ready to heat things up, carbon fiber heating elements move with riders, without creating hotspots. Stretch panels help with fit, so heating elements stay close to you for the best thermal performance. All Synergy products use a 12v system with 3 adjustable heat settings. Warm up in a Tour Master Synergy Vest for your next ride.