Which Nike product innovation was originally created by pouring rubber into a waffle iron, leading to the revolutionary 'Waffle Trainer' design?

Nike has revolutionized sports apparel and footwear through decades of innovation. From their first waffle-soled running shoes to modern performance gear, their product design history is filled with fascinating breakthroughs. This trivia question explores a pivotal moment in Nike's product development that changed athletic footwear forever. Test your knowledge of how this global sports brand evolved their products to meet the needs of elite athletes and everyday consumers alike.

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Nike Air cushioning system
The Waffle outsole
Flyknit upper material
Nike Free flexible midsole