The Mackintosh or raincoat (abbreviated as mac or mack) is a form of waterproof raincoat, first sold in 1824, made out of rubberised fabric. The Mackintosh is named after its Scottish inventor Charles Macintosh, though many writers add a letter k (this variant spelling "Mackintosh" is now standard ).Although the Mackintosh style of coat has become generic, a genuine Mackintosh coat should be made from rubberised or rubber laminated material.