New Flyknit feels
Ultra-stretchy yarns in the forefoot enable optimal flexibility, while tighter yarns around the perimeter of the upper and heel provide structure and durability — a new sensation for Nike Flyknit in a training product.
The laces are wider than before, which helps to maximize the stretch of the upper while also activating the various knit zones that provide lateral support.
In previous Nike Free TR shoes, the upper was placed on top of an outsole (similar to how a hamburger sits on top of a bun). Now, the tooling wraps up and around the foot (more like how a hot dog sits in its bun), providing better containment and support and allowing for a more minimal upper without sacrificing flexibility.
The outsole siping increases and extends up the sidewall of the forefoot to maximize the foot’s natural motion, allowing it to expand and flex.
The upper stretches with your foot to accommodate movement and loading. Less reinforcement in the forefoot allows the shoe to adapt to different types of impacts.
For the first time, designers considered the outsole’s forefoot and heel separately. They then mapped the bottom of the foot to determine how to build in different performance attributes, resulting in concentrated siping in the forefoot for maximum flexibility and more rubber in the heel to improve stability.
More rubber and stability in the heel — which is also flatter than previous versions — helps to prevent the foot from slipping away from the back of the shoe during vertical, linear and lateral movements like squat jumps, sprints and speed-skater lunges.