Here’s an interesting article from Gizmodo discussing the history of Nike Air.
Like many soul-searching 1990s adolescents, I was obsessed with Nike Air technology. I’d pore over the latest innovations, from visible forefoot air to tuned air to other types of air. I’d even buy used sneakers at the flea market and tear them apart to inspect the air. As my young brain developed and my understanding of biomechanics advanced, however, I came to a realization: Nike Air is bullshit.
Source: The Absurd History of Nike Air Technology