Tour Master Synergy heated apparel is an easy way to stay warm when temperatures drop for changing seasons. Ready to ride, the Synergy Vest with Collar hooks into existing Synergy clothing with no problems. Just like non-collared versions, a 3-way adjustable temperature switch controls carbon fiber heating elements. Stretch side panels provide a snug fit to hold heated panels close for consistent heat control. Plug in a Synergy Vest with collar to keep core temps from dropping in cold weather.