The Nike Alphafly 3 is Amazon’s premier marathon racing shoe—blending elite propulsion, comfort, and lightweight design. If you’re chasing personal bests or high-level race performance, it delivers unmatched energy return and smooth transitions. However, it’s specialized gear: best suited for race days and well-executed training, rather than daily use. Those with wider feet or looking for alls-round stability might need to explore broader-fitting alternatives.