🔥UPGRADED MATERIAL:100% polyester, not only warm but also comfortable to touch. This versatile heated vest from ANTARCTICAGEAR is lightweight, comfy, and could work as a mid or outer layer. 🔥HEAT ON-DEMAND:Just connect the battery pack, turn it on and then adjust the temperature(high, medium, low) with a press of the button. It heated up quickly in 5 seconds, with noticeable warmth on the back, waist, and neck. It can last around 10 hours on low or 4.5 hours on high. 🔥CARBON FIBER HEATIING ELEMENTS:Four carbon fiber heating elements are located on the chest, back and neck and are highly effective to give you the heat you need straight to the core. Perfect as a mid-layer, the ANTARCTICAGEAR heated vest is an ideal addition as a layering option for evolving winter conditions. 🔥COMPLETE PROTECTION:Smart 12V 2A 16000mAh delicated power bank, heated the vest fastly. All the heated vest and the battery built with multiple circuit protection automatic low-charging system, Effectively preventing battery(over-charging, short-circuit, high-temperature, and surge protection), and high-quality, fire-resistant construction, safety to use. 🔥WASH&DRY SAFE: Easy care, Machine Washable, the jacket have body protection function, when the temperature is too high, it will stop working immediately. Please take out the power bank and put the USB plug in the pocket before washing. ONE YEAR WARRANTY covered.