A quilted jacket is a padded waist-lenght or hip-lenght coat with two or more layers of fabric stitched together in a pattern, often diamonds, to hold insulating material like down or synthetic fibers in place. This construction traps air for warmth, making the jacket lightweight yet warm and versatile for different weather conditions. Quilted jackets are popular for both casual and outdoor wear due to their combination of comfort, style, and practicality.