The Gerbing 7V Battery Men's Heated Pants are designed to offer warmth even during extreme cold. Equipped with microwire heated panels, the pants provide stable and optimal insulation. There is a 2600 mAh battery included with the pants, providing you constant warmth for 8 hours on the lowest settings and up to 2 hours on the highest warmth setting. Plus, their style and comfort are unparalleled, as they are manufactured using a special blend of polyester and spandex. They are stretchy and comfortable enough to provide mobility for adventurous activities, including climbing, trekking, and running. Also, the pants can heat up to 135° when used on the highest setting to keep you insulated even during the coldest night outings. Best of all, these pants are machine washable.