• All open-box products are inspected and come with 6-month limited warranty on both heating elements and battery. Final Sale, no exchange or return.
• Built with ultra-thin carbon nanotube heating elements to produce heat evenly and continuously, warming up your core body without adding bulkiness.
• Mock-neck collar and elastic hem provides extra protection from the wind and seal the heat.
• Easy to mix and match. Using over a long-sleeved shirt on chilly fall days or layering under a jacket for cold commutes and epic ski days makes it a perfect multi-use layer.
• 3 carbon fiber heating elements generate heat across core body areas (left & right-hand pockets, upper back)
• Adjust 3 heating settings (High, medium, low) with just a simple press of the button
• Up to 10 working hours (3 hours on high, 6 hours on medium, 10 hours on low heat) 
• Heat quickly in seconds with 7.2V UL/CE-certified battery
• USB port on battery for charging smartphones and other mobile devices