Perspective from a product expert: The Women's Heated Pullover is designed to provide fast, long-lasting warmth with its 3 heating zones and updated carbon fiber heating elements. It has a concentrated heating zone in chests & upper-back and a USB input for universal power bank usage. The fabric is made of 80% cotton and 20% polyester, providing both warmth and breathability. It's suitable for temperatures between 10° F to 54° F and can be worn for various outdoor activities such as walks, hikes, and sports.