Though the term "blazer" is often use as a synonym for "sportcoat", a blazer or boating jacket specifically refers to a type of jacket, often double-breasted although single-breasted blazers have become more common recently. A blazer resembles a suit jacket except that it usually has patch pockets with no flaps, and metal shank buttons. A blazer's cloth is usually of a durable nature, as it is used in schools and was used for sport.