Alphafly 4 Total Orange / Burgundy Ash-Hyper Crimson

From Nike

Nike Alphafly 4 Running Shoes - More Energy, Less Weight for Marathon Racing

Our legendary racer is back and lighter than ever. The Alphafly 4 updates the Air Zoom unit for the first time in the shoe's history, softer, quieter, and delivering more energy return. Dual ZoomX cushioning with new ZoomX LT foam, wide carbon-fibre Flyplate, and advanced Atomknit upper with open-hole mesh zones. Your marathon potential, unlocked.

Updated Air Zoom Unit — Softer, Quieter, More Energy

For the first time in the Alphafly's history, the Air Zoom unit has been updated. Softer and quieter than previous models whilst delivering more energy return underfoot — don't let them hear you coming. Added cushioning under the curved forefoot enhances protection and propulsion through the full 26.2 miles.

Manufacturer's description, supplied via the retailer feed.