The Zoom Vaporfly Elite 4% was already a near-perfect marathon shoe. But its Flyknit upper retained water. In an effort to solve this problem, the Nike Zoom Vaporfly Elite Flyprint was born. Flyprint is a Nike innovation that is produced through a type of 3D printing called solid deposit modeling, which allows for different densities of material to be placed at different points on the upper. The layout of the weave is partially determined using computational design and can be quickly customized for individual athletes resulting in added comfort and stability. The near-translucent upper is porous, so it doesn't hold water, and is 6% lighter than its Flyknit cousin, yet seamlessly bonds with Flyknit components like the tongue and collar. They will be on the feet of Eluid Kipchoge as he tackles his next marathon in London on April 22nd, and a limited run of the shoes will be available in the city that weekend via the Nike app.