The Harkila Clim8 insulated waistcoat is an intelligent self-regulating garment that can be controlled directly on the waistcoat itself by tapping the clim8 logo or fine-tuned by using the clim8 app. The waistcoat has down insulation, a wind-resistant lining, and a heat-reflecting liner that directs the heat back toward the body. The clim8 waistcoat is powered by a power bank through a USB connector. Power bank is not included. Harkila Clim8 Insulated Waistcoat Willowgreen