Which innovative shoe sole design, first introduced in a running shoe in 1979, featured visible air cushioning technology that revolutionized athletic footwear?

Product design in sports equipment has evolved dramatically over the decades, with footwear being at the forefront of innovation. One particular breakthrough in the 1970s revolutionized running shoes and subsequently transformed the entire athletic footwear industry. This trivia question explores a pivotal moment in sports product design that continues to influence how performance athletic shoes are created today.

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Nike Air
Adidas Torsion
Puma Disc System
Reebok Pump