Premium Grade Materials. 3 Heat Zones. Up to 10 Hours of Warmth. Wind and Water Resistant. Machine Washable. The Men’s Dune heated puffer vest brings you versatility, warmth and control over your own heat. It’s built-in heating system uses conductive-thread technology, powered by an industry-leading 6500 mAh lithium-polymer battery. This combination gives you up to 10-hours of heat at your fingertips. The Dune heated vest can be worn over just a t-shirt or can be worn under a coat for that extra layer of warmth. Imagine looking great and controling your own heat. Whether you are battling the chilly morning commute, meeting up with friends on the town or heading into the woods, this is the vest you want. Dune’s intuitive 3-Bar LED controller gives you easy one touch control of your heating level. Heating up to toasty 140 degrees, your Dune equips you with the power to go anywhere you need to in the cold. Available is seven sizes and multiple color options, you can find the perfect choice! Features include: 3 individual heat settings, Soft and silky Nylon outer, 6500 mAh lithium-polymer battery pack and charger