1 colorway of the Nike ReactX Infinity Run 4 on SoleBook.
The Nike ReactX Infinity Run 4 is the newest chapter in a running lineage that Nike built around injury-prevention marketing rather than raw speed. The original Infinity Run launched around 2020, positioned as the brand's "most protective" trainer, aimed at everyday runners logging mileage rather than racers chasing podiums. Its selling point was a wider platform and a rocker geometry meant to reduce the kind of repetitive strain that sidelines recreational runners, a departure from Nike's usual focus on marginal performance gains for elites. By the time the line reached its fourth iteration, Nike swapped the original React foam for ReactX, a compound the brand claims cuts carbon footprint while improving energy return, part of a broader push to make foam production more sustainable without sacrificing bounce. The silhouette itself has stayed fairly consistent across generations: a chunky, stable-looking midsole, engineered mesh uppers, and a Flyknit-adjacent construction on select colorways. It's never carried the hype of Nike's racing flats or retro Dunk reissues, but it's carved out a steady niche among runners and casual wearers who prioritize cushioning and durability over trend-driven design, retailing in the standard performance-running price bracket.