Everything started from runners who wanted to maximum the fit of the shoes, which would make an impression of "second skin", or socks. Brand designers had quite a challenge, to meet a standard that high. After all, they undertook this task and together with a team of specialists spent four years searching for the perfect solution. The result of these studies is durable material woven in Flyknit technology, providing fit, lightness and airiness. Upper wrapping the foot is almost completely devoid of seams, making it practically imperceptible. In addition, the shoes use Dynamic Flywire technology inspired by the spans of bridges, so the durable links, which are part of the bonding system. Their task is to keep the metatarsals in the correct position, and support and not interfering with the natural movements of the foot, both during walking and intensive running. Women's Nike Flyknit Racer shoes have an already mentioned Flyknit upper. On the heel there's a loop for easy donning, which also acts as a reflection. The monolayer structure of the material makes the woven material also function as a lining inside the shoe. It is accompanied by a removable insert lined with textile material. The whole is based on the sole, which was also designed for runners. We have here a great cushioning middle part of Phylon foam, supplemented with Zoom Air bag in the forefoot. Outer part is formed by adhesive rubber with waffle tread and pattern with diamonds.