Which product design innovation resulted from Bill Bowerman (Nike co-founder) pouring rubber into his wife's waffle iron in the early 1970s?

Test your knowledge about the groundbreaking product design collaboration that revolutionized running shoes and created one of the most recognizable design elements in sports footwear history. This partnership between a scientist and a major sports brand led to an innovation that changed performance footwear forever and sparked countless imitations across the industry.

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The Air cushioning system
The waffle outsole pattern for better traction
The Pump inflation technology
The Flyknit upper material