The patented Gerbing Microwire system is the most durable and efficient heating platform ever developed. Products incorporating Microwire technology utilizes patented micro-sized stainless steel fibers intertwined and encased in a proprietary waterproof coating. Powered by our 7V Rechargeable Lithium-ion Battery Pack, you can layer up for the cold no matter the conditions. Exceptional warmth is delivered via three strategic heating zones and a lofted anti-pill composition. Stay warm while others are feeling the cold bite! Our Gerbing 7V outerwear is the perfect combination of warmth, comfort and style. The soft feel and modern fit of these great heated garments make them an absolute must-have this winter season. We promise you're going to love Gerbing Heated Clothing. Fully charged in 2 - 8 hours • Up to four power levels (Gloves - 6hrs on low power, 4hrs on medium and 2hrs on high, vests & jackets - 8hrs on low power, 6hrs on medium, 4hrs on high and 2hrs on extreme • Premium A cells with thermal and short circuit protection