A top coat is a protective layer applied over nail polish to enhance its durability and shine. It helps prevent chipping and fading, ensuring that manicures last longer. Top coats can also provide a glossy finish or a matte look, depending on the desired effect. In addition to nail care, the term "top coat" is used in fashion to describe a type of outerwear. These coats are typically worn over other clothing for added warmth and style. They come in various materials and designs, making them versatile for different occasions and weather conditions.