Which unlikely household item directly inspired Nike's famous Air cushioning technology that transformed their product development and brand positioning?

In the competitive world of sports retail, product innovation can completely transform a brand's positioning and market share. Nike's Air cushioning technology represents one of the most significant innovations in athletic footwear history, changing how performance shoes are designed and marketed. This technology revolutionized the industry by offering superior impact protection for athletes while creating a distinctive visual identity that helped Nike establish its dominance in the sports market.

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A medical IV bag
A waterbed mattress
A car tire
A bicycle inner tube