Nike introduced Flyknit, a technology that I contend is the greatest method for shoe upper manufacturing in 2012. This material and it’s weaving process bring a second-skin fit and feel to shoes and is a completely natural fit to the Free series. The nike free 4.0 flyknit is a shoe that has been praised by some very tough critics and for good reason.
Even just trying them on for the first time the fit and feel of the upper is incredible, a massive step up from the original Free Flyknit+ which was narrow, tight, and curved the entire toe-box of the shoe up. Going up a half size in the original Flyknit left my foot feeling cramped while the current version fits true to size.
The mid-sole is made of Phylite, which is essentially Nike’s version of a blown rubber material, which functions as a foam tough enough to be used as an out-sole. What that translates into is a fairly firm yet reasonably cushioned ride, which is a fairly standard ride for similarly lightweight and minimal shoes.
Right away, the flexibility of the midsole/outsole is remarkable. The waffle patterned cuts extend the full length of the shoe so no matter where your foot bends and flexes, resistance from the shoe is minimal at most. The stack heights of the nike flyknit free are 20mm in the heel and 14mm in the forefoot (for a net drop of 6mm) which keeps the shoe in a comfortably natural geometry. The rear of the sole is a bit shaped which makes for a rapid and smooth transition from the rear of the foot, forward. Since I tend to be a midfoot/forefoot runner the primary contact and wear point for me has been the lateral midfoot.
Nike Free 4.0 Flyknit Special is really a fantastic and comfortable sheos for casual wear,do not hesitate to get your nike flyknit lunar!