A fleece jacket is a lightweight, insulating outer layer designed to provide warmth and comfort in cooler weather. Made from soft, synthetic fabrics like polyester, fleece jackets trap heat while remaining breathable, making them ideal for outdoor activities, casual wear, or layering under heavier coats. They are versatile, easy to move in, and often feature zips, pockets, and high collars for added functionality, making them perfect for hiking, travel, or simply staying cosy on chilly days.