You may have worn a lot of coats, but you have definitely not worn a coat with a solar charging panel. The jacket is made of wool and nylon and has 7-10 solar charging panels on the back and a built-in 6000 mAh battery pack. When there is sunlight, the solar panel will charge the built-in battery pack, and it has two USB ports so you can charge your phone at any time. The battery pack is removable and can be removed when not in use. Of course, the removed battery pack can be charged using an ordinary mobile phone charger, and the pocket can also be removed. This special jacket is available in two styles for men and women. It not only keeps you warm but can also be used as a mobile power source.