Which Nike technology was temporarily banned by World Athletics (formerly IAAF) in 2020 due to concerns about providing unfair advantages in marathon racing?

Nike's innovation has transformed athletic performance over decades. From the waffle iron outsoles of the 1970s to today's advanced materials, their product development has pushed boundaries in sports technology. This poll tests your knowledge about one of their most controversial and game-changing innovations that sparked debates about competitive advantages in professional running.

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Nike Vaporfly with ZoomX foam and carbon fiber plate technology
Nike Flyknit with 3D-knitted upper technology
Nike Shox with column-based shock absorption system
Nike Air Max with visible air cushioning units