I bought this shirt a little over a year ago and ended up only wearing it two times.
The ActionHeat base layer shirt is a great option for people who want to stay warm but not wear bulky layers. The shirt is designed to be worn under another garment as a base layer.
The ActionHeat heated shirt comes with a powerful ActionHeat 5V Power Bank 6000mAh. This power bank powers your garment and can also charge your phone, tablet, or any USB charged device. Note: Heating times will diminish if used to charge other devices.