MacBook Air features a unibody design for both the main enclosure and the display. Unibody construction means a higher-precision, less complex design with fewer parts. That translates to a notebook that"s exceptionally thin and light, yet durable enough to handle the rigors of everyday use. Thin, light, durable. Even at less than an inch thin, MacBook Air sets a pretty high standard - by making flash storage standard. Flash chips are very compact, allowing MacBook Air to be incredibly thin and light.