Which innovative sports technology feature did Nike first introduce with its 2012 Flyknit Racer running shoes?

The sports footwear industry has undergone remarkable technological transformations in recent decades. Major brands continually race to develop innovative materials and designs that enhance athletic performance. From cushioning systems to energy return technologies, these advancements have revolutionized how athletes train and compete. Test your knowledge about a groundbreaking product launch that changed the athletic footwear landscape!

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Knitted upper made from a single thread, reducing waste by 80% compared to traditional cut-and-sew methods
Air-cushioned soles with visible air pockets in the heel for enhanced shock absorption
Self-lacing system powered by small motors that automatically adjust fit during movement
Biodegradable midsole made from algae-based foam that decomposes within 3 years after disposal