When you need a jacket to keep you warm hoping in or out a building, at an an outdoor concert, or a mid layer in the Arctic Circle, the ember is the jacket. When it starts to get cold hit the button and the heat comes. The battery lasts a long time and can charge your phone as a bonus. This jacket is a game changer.
Ember made Aurora Borealis chasing enjoyable. Nighttime temps were -1 to -30. The ember was my mid layer. I would power up then step outside for 30 mins at a time. My core was always warm. When the lights popped I was ready. Will never travel without it.