Update: Free RN Flyknit
Arch support
M: 214g | W: 178g
Heel to toe drop
M: 6mm | W: 6mm
Heel height
M: 23mm | W: 23mm
Forefoot height
M: 17mm | W: 17mm
Widths available
M: Normal - D | W: Normal - B
Show moreless facts


Shoes best for road, track and light gravel. See the best road shoes.


Shoes best for trail, off road, mountains and other unstable surfaces. See the best trail shoes.

Good to know

As long as you stick to the road or path, and if you want just one running shoe, buy a road running shoe.

Neutral / cushion / high arch

Shoes for runners who does not need any additional arch support (Around 50% of runners). Best for people with high or medium high arches. See the best neutral shoes.

Stability / overpronation / normal arch

Shoes for runners who needs arch support (Around 45% of runners). Best for runners with a normal arch. See the best stability shoes.

Motion control / severe overproanation / flat feet

Shoes for runners who needs a lot of arch support. Best for runners with flat feet. See the best motion control shoes.

Good to know

- Rule of thumb: If in doubt, buy neutral shoes to avoid injuries.
- More about arch support in this video.
- Find your arch type by following steps from this video.

Daily running

Cushioned shoes for your daily easy running. Great comfort. See best shoes for daily running.


Lightweight shoes good for races, interval training, tempo runs and fartlek. Here are the best competition running shoes.

Good to know

If you want just one pair of shoes, buy a shoe for daily running.

The height difference from the heel to the forefoot, also known as heel drop, toe spring, heel to toe spring or simply drop.

There are many opinions about what a good heel drop is. We do not recommend any in particular. Lean more in this video.


We spent 9.1 hours reading reviews from experts and users. In summary, this is what runners think:

7 reasons to buy

  • A stretchy polyester yarn makes up the upper unit of this running shoe and it effectively delivers breathable support for the foot.

  • Many reviewers greatly appreciated the flexibility that the 4th version of the Free Flyknit has to offer.

  • The different designs and color schemes placed a lasting positive impression on those who tried it.

  • The underfoot comfort is precise and the cushioning is effective.

  • Reviewers thought that the rounded heel worked pretty well because it encourages a more consistent stride.

  • The Flywire integrations to the sides work really well to enhance the fit.

  • The Nike Free Flyknit 4.0 feels light and fast.

2 reasons not to buy

  • The complaints for this running shoe stem from its initially inconsistent flexibility, though over time the full flexing capability of this shoe will stand out.

  • The mild arch support wasn’t very well-received because some runners felt they deserved more underfoot cradling from this running shoe.

Bottom line

The Free Flyknit 4.0 from Nike is actually one of the most popular running shoes on the market. Many tried it out and felt the comfort, the cool design and the consistent fit that it presented. It is a neutral running companion that offers mild underfoot support, as well as responsible durability.

World wide, Free Flyknit 4.0 is in the bottom 50% most popular running shoes. The brand, Nike, is the 1st most popular.

Map: Shows popularity per continent based on 1010 shoes


4.6 / 5 based on 727 ratings

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Expert reviews

Experts are running shoe geeks, who post reviews at youtube, directly at RunRepeat or at their own websites. Each expert is categorized from level 1 to level 5 based on expertise. See stats on expert reviews and how we calculate scores here.

Are you an expert? Apply to contribute here.

87 / 100 based on 15 expert reviews

  • 88
    JeffLevel 2 expert
    by Riz Knows
    It is lightweight, breathable, thin, and super comfy.
  • 85
    Packing LiteLevel 1 expert
    by Packing Lite
    Although these are originally aimed at runners, they actually make for a very comfortable working shoe.
  • 90
    SolereviewLevel 5 expert
    by Solereview
    The heel area’s got a nice upwards slope or bevel for rear-foot strikers; and if you land in the front, a colony of tightly grouped foam hexagons spread loading evenly.
  • 88
    Donald BuraglioLevel 5 expert
    by Gear Institute
    The shoe feels like an extension of your foot, but provides just enough cushioning and responsiveness to comfortably roll through the miles.
  • 86
    Brandon WoodLevel 5 expert
    by Gearist
    The comfort of this shoe is hard to beat. It’s ability to adapt to the foot of a wide variety of people both in the upper and in the midsole/outsole give it a huge step up.
  • 80
    Runner's WorldLevel 5 expert
    by Runner's World
    Buttery smooth--on your foot and on the ground.
  • 95
    ThomasLevel 4 expert
    by Believe In The Run
    This shoe was an unexpected treat. I am pretty much over minimal shoes at this point.
  • 90
    Taylor GuptonLevel 3 expert
    by Running Shoes Guru
    It’s hard to believe that the Nike Free franchise has entered its 11th year, but the barefoot-inspired series is enjoying more fans than ever with the introduction of the Flyknit upper and an update to the sole unit.
  • 90
    Kyle JangLevel 3 expert
    by RunRepeat
    The Nike Free Run Flyknit 4.0 is a sharp looking shoe that combines fashion with functionality. It is very lightweight and has a flexible midsole that makes it ideal for many different kinds of athletes. The Flyknit upper is amazing and stretches to fit your foot like a sock.
  • 83
    Thomas/MeaghanLevel 3 expert
    by Believe in the Run
    It’s a flexible, super light shoe that has a really nice amount of cushioning.
  • 88
    Scott StevenLevel 2 expert
    by Running Shoes And Advice
    It has everything that I personally look for in a running shoe. 
  • 90
    Peter LarsonLevel 1 expert
    by Run Blogger
    The Nike Free 4.0 Flyknit is a fantastic shoe, easily one of my favorites so far this year. If you want something with a minimal upper, a flexible sole, and a roomy toebox these should be at the top of your list of options to try.
  • 82
    Riot MalPalLevel 1 expert
    by Riot MalPal
    These are unlike any other shoes, they are just like socks.
  • 81
    HenriLevel 1 expert
    by Henri VITUS
    They are sweet, breathable, flexible and comfortable.
  • 77
    Kicks x2Level 1 expert
    by Kicks x2
    The upper just makes it a really nice shoe.
  • Show moreless reviews
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These are visual presentations, not reviews

  • Nuclear Ghost
    I like them, I really like them.
  • Jadalyn Jadalyn
    Oh! These are just so beautiful.
  • Moldy912
    The colors can work for the men and women.
  • Jacob Thompson Jacob Thompson
    The flexibility of the 4.0 outsole and the flyknit body is great.
  • Upper90 Goal
    The Flyknit material really feels like a glove when you put them on.
  • Ryan Clarke Ryan Clarke
    These are just very light.
  • Matt Creative
    These are my favorite shoes for the past years.
  • Elijah Wireman Vlogs
    These are straight killers right here.
  • Nimsta Boi Nimsta Boi
    They can bend pretty good.
  • Clothingunboxing
    They're designed to let your foot move freely and more naturally.
  • Rocks Unboxing
  • isaaggiii
  • Ali Aldahier

Updates to Free Flyknit 4.0

The Nike Free Flyknit 4.0 is a running shoe that delivers a comfortable coverage and a performance that’s reliable and consistent. Appealing color schemes are integrated into this shoe, so the runner gets more aesthetic flair when wearing it. It looks cool and it feels very responsive when taken on the roads.

The upper unit uses a material that resembles a woven cloth. It’s durable, breathable and very comfortable to the skin. It doesn’t restrict natural movement, so the foot is allowed more flexibility even when wearing the shoe. A snug, but secure fit is handled by the Flywire cables, which connect directly to the lacing system.

The mid-sole system utilizes a foam unit that’s soft, responsive and flexible. It has a low-profile height, so it doesn’t limit the movements of the foot. Still, it is able to deliver sure underfoot support that’s consistent and efficient. The 6mm drop and a rounded heel enable a more natural striking of the foot. This version has more cushioning than the Nike Free Flyknit 3.0.

On specific areas of the outsole is a durable rubber material that’s made to provide protection against wear and tear. Traction is also a part of this unit’s purpose. Natural flexibility is handled by hexagonal flex grooves.

Free Flyknit 4.0 size and fit

The Nike Free Flyknit 4.0 has a regular shoe length. It follows the standard measurements when it comes to the men and women’s sizes. Its semi-curved shape allows the natural curvature of the foot to acclimate well to it. The available width is medium.


When looking at the outsole layer, one can definitely notice some durable rubber placed in critical areas where wear and abrasion are most likely to appear. Aside from delivering protection, this rubber also provides traction over the surface.

Hexagonal flex grooves are cut all over the sole unit’s external surface. These grooves allow the platform to move according to how the foot flexes, so natural motion is actually being encouraged.

Waffle pistons are observed in specific sections of the outsole. They give some bounciness to each step, making sure that the foot’s landings and the liftoffs are well-cushioned and supported.


The Phylite mid-sole material is a responsive yet durable foam unit that serves as both the underfoot platform and the outsole unit of the Nike Free Flyknit 4.0. It is not heavy, but it is able to provide sure support for the underfoot. It’s 40% rubber, so it stays strong even after many uses.


The lightweight Flyknit upper technology is one of the most breathable fabrics when it comes to running shoes. It allows air to seamlessly enter the shoe to keep the foot cool and dry. Its woven-cloth-like quality doesn’t irritate the skin, so it stays comfortable at all times.

The Flywire cables are connected directly to the lacing system. When the shoelaces are adjusted these cables follow suit, making sure that the upper unit is able to wrap around the foot in a snug, but secure manner.

A molded sock liner follows the natural contours of the foot. It supports the underside of the foot, keeping it in place and maintaining constant cradling, even for the arch.


Comparison to category means
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