In the early days of Nike, athletic apparel made with running specifically in mind was basically nonexistent. The Windrunner jacket became a fixture in the Nike catalogue. Of course, technology has come a long way since the 70s. The recognizable shape may be the same, but the lightweight, ripstop construction, improved warming and ventilation technology ensures that the Windrunner stays right in the thick of active competition.
If a size is not listed, it is sold out.