The key to maximizing thermoregulation is insulating the body's core. The Elevation Vest is constructed with 100% poly interlock with stretchability and breathability. The vest is lined with plush fleece for addional insulation. The sleek and athletic design allows the vest to ride comfortably under the Elevation Jacket or to be worn alone as the temperatures climb. An innovative neck design allows the neck to be free of excess collar fabric that can bunch and bind when layered. Zippered hand pockets in the front and external lumbar pocked on the back are perfect for stowing valuables.