This is the lady's jacket that provides 10+ hours of continuous low heat from imperceptible heating elements located in the back and front. The softshell exterior is made from a water- and wind-resistant 86% polyester/14% spandex blend lined with brushed fleece, both of which encapsulate polyester fill that insulates the body against the cold when shopping or doing errands. The micro-alloy heating elements are designed with a thin mesh overlay that provides three levels of safe, efficient heat transfer to the fabric. An unobtrusive back left pocket cleverly conceals the included USB power bank that connects to the heating elements via microUSB and provides up to four hours of warmth on high (up to 7 1/2 hours on medium; 10 hours+ on low) after a full charge from a USB power source. Black. Women's. Sizes S (chest 41-42", waist 42-43", length 25"), M (43-44, 44-45, 25 1/4), or L (45-46, 46-47, 25 1/2). (2 3/4 lbs.)