The 5V Heated Balaclava will most likely be your most versatile piece of winter gear you'll ever own. Crafted for the winter adventure seeker, the breathable Fleece is fully lined and stretchy to fit over your head and goggles. Charge up the 5 V Battery with the provided charging cable and plug into the USB in the zippered back pocket. The heating elements heat up within 10 seconds for immediate warmth and can last up to 4.5 hours at the right heat setting. The lower the heat setting, the longer the battery will last and vice versa. Not only will this Balaclava keep you incredibly warm, but it can be worn as a hood, facemask, scarf, and can also be cinch up to create a smaller bag for goggles and smaller items in a pinch. Breathable Fleece Lined Stretchy Soft-Shell, Water Resistant Properties, Built-In Heating Panels- Placed Over Both Ears, Back Power Bank Pocket, 5-Volt Battery w/2-Amp Power System, FAR Infrared Heating and ActionWave Heat Reflective Technology, 4 LED Power Indicators Display Power Banks Battery Life, High (Red): 150F - 2+ Hours Estimated Heating Time, Medium (White): 130F - 3+ Hours Estimated Heating Time, Low (Blue): 110F - 4.5+ Hours Estimated Heating Time, 5 Ways to Wear: Balaclava, Hood, Facemask, Scarf and Bag,