夏布 is a traditional Chinese fabric made from ramie fibers, historically woven by hand in the summer months (hence the name 'summer cloth'). It's a lightweight, breathable textile used for summer clothing and household items, and carries cultural significance as a heritage craft in regions like Jiangxi and Hunan. The term is a specific cultural artifact — not interchangeable with modern 'linen' or 'ramie cloth' in general.