The ZR9 Heated Vest Liner with ZEPTO fiber represents the latest innovation in heated clothing technology. Lightweight built-in rechargeable batteries make this heated vest perfect for skiing, snowboarding, or just taking a walk on a cold day.Features:Leverages ZEPTO fiber technology; made in France, these heating fibers are so thin you wouldn't be able to notice them if not for their tremendous heat outputZEPTO fibers are lighter and heater up faster than the heating wire in our Gen-X3 line of heated clothingUniform heat delivered all over the front, back, and collarBuilt-in 6 level temperature controller with LED indicator lightAnti-bacterial, breathable, and windproof fabricLycra side panels ensure the heated vest will ergonomically hug the contours of your bodyBottom edge of the vest lands just above the beltline thus maintaining your range of motionTwo front side pocketsMaintenance: Our lithium-ion batteries are made of high-quality Samsung cells. Maintain at least 25% of the battery's capacity when not in use. If left uncharged the battery will go into the deep discharge and won't turn on. Please note that the battery is covered by a 30-day warranty.Sizing:Make sure you are wearing only a t-shirtMeasuring your chest (just under the arms), and then your stomachTake the larger of these two measurements as your reference pointA 42 size vest is a good fit for a person with a 42-inch reference point (when worn properly the vest should hug the contours of your body)Specifications:Vest produces 53 watts of heat and draws 3.9 Amps of currentThe length of time that the vest can continue to generate heat starting from a full charge varies depending upon your desired temperature.Level 1 (least heat setting) - 5.7 HoursLevel 2 - 3.45 HoursLevel 3 - 2.47 HoursLevel 4 - 2.0 HoursLevel 5 - 1.6 HoursLevel 6 (most heat setting) - 1.36 HoursIn the box:ZR9 Heated Vest LinerRechargeable 5200mAh battery packWall charger Gears Canada 12V Unisex ZR9 Built-in Battery Heated Vest Liner