Fine-tuned for marathon speed, the Alphafly 3 helps you push beyond what you thought possible with three innovative technologies. A double dose of Air Zoom units works with a full-length carbon-fibre plate to help launch you into your next step. The ZoomX foam midsole helps keep you fresh from mile 1 to 26.2. Time to leave your old personal records in the dust. Propulsive Air Zoom Units:Two Air Zoom units in the forefoot store and return energy back to you, helping power your every step.,ZoomX Foam Cushioning:The ultralight ZoomX foam midsole is fully connected to the outsole, providing you with a smooth transition and optimised responsiveness throughout your race.,Full-length carbon-fibre plate:A slightly wider carbon-fibre Flyplate gives you a propulsive and stable feel with each step and turn. Whats new?: Lightest Alphafly ever. Wider carbon-fibre plate for increased stability. Improved multidirectional containment and breathability. Fully connected ZoomX foam midsole for smoother transitions. Notched laces offer a secure but soft lace-up.Integrated knit tongue with lofted padding helps alleviate lace pressure.