About A Chair AAC21 by HAY combines an aluminum swivel base with a streamlined, upholstered polypropylene shell. A result of close collaboration between designer Hee Welling and HAY, About A Chair is a collection of outstanding simplicity and combinability. With About A Chair collection, Welling wanted to reach a new level in the combination of shape, function, comfort, detail, and esthetic. The idea behind the collection was to develop a chair which works well around the dining table, around a conference table, as well as in a restaurant, cafeteria or at the office. Due to their simple and plain design, the chairs can be combined with many types of furniture and interiors.