Launched December 2025, ANTA Zone 2 is a daily training collection built around one truth: 80% of running should feel easy. Named after the aerobic heart rate zone (60-70% max HR), these plateless trainers use Nitro90 foam—supercritical nitrogen-infused midsoles delivering 90%+ energy return without carbon fiber rigidity. The result is natural, sustainable cushioning that protects your legs through high-volume weeks. Three tiers cover every runner: Zone 2 90 (188g flagship), Zone 2 85 (stable support), and Zone 2 80 (daily essential). For runners who train smart to race fast.