Insulated jackets are designed to keep the wearer warm in cold weather by trapping body heat. They are typically filled with materials like down or synthetic fibers, which provide excellent insulation. The outer layer is often made from water-resistant or windproof fabrics to protect against the elements. These jackets come in various styles and thicknesses, making them suitable for different activities, from casual wear to outdoor sports like hiking or skiing. Many insulated jackets also feature adjustable hoods, cuffs, and pockets for added convenience and comfort during use.