Why You'll Love It: The Alphafly 3 is Nike's lightest Alphafly ever, featuring a slightly wider carbon fiber plate for increased stability, a fully connected ZoomX foam midsole for smoother transitions and an all-new Atomknit upper designed for improved multidirectional containment and breathability Category: Racing Flat Weight: 7.6oz Drop: 8mm Fine-tuned for marathon speed, the Alphafly 3 helps push you beyond what you thought possible. Three innovative technologies power your run: A double dose of Air Zoom units helps launch you into your next step; a full-length carbon fiber plate helps propel you forward with ease; and a heel-to-toe ZoomX foam midsole helps keep you fresh from start to 26.2. Time to leave your old personal records in the dust. KEY FEATURES: Energy Return for Your Marathon: Two forefoot Air Zoom units combine with ZoomX foam to store and return the energy back to you, powering every step. Propulsive Feeling: A full-length carbon fiber plate delivers a propulsive sensation that helps you smoothly transition through every stride and tackle turns with confidence. Cushioned Ride: Fully connected ZoomX foam creates an ultralight and cushioned feel, helping you stay fresh and comfortable from mile 1 to 26.2. Notched laces offer a secure but soft lace-up. Integrated knit tongue with lofted padding helps alleviate lace pressure. SIZING GUIDE Unisex racing flats use men's sizing. For a women's fit, take your general shoe size and subtract 1.5 (ie: a women's 8.5 would be a unisex 7 for this shoe).