Alphafly 3 Shoe Size:13 The extra deep heel pocket

The extra deep heel pocket and high heel tab ensure that the sock won't slip down into the shoe

just like this frame

round lens design

or daily movement needing cushioned support

Alphafly 3 Shoe Size:13 The extra deep heel pocketFine 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. Energy Return for Your Marathon Two