• Discontinued
  • Terrain


    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.

  • Arch support
    Arch support

    Neutral / cushion / high arch

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

    Stability / overpronation / normal arch

    Shoes for runners who need mild to moderate arch support (Around 45% of runners). Best for runners with a low arch. See the best stability shoes.

    Motion control / severe overpronation / 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.

  • Use

    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.

  • Price
  • Weight
    Men: 7.5oz
    Women: 6.3oz
  • Heel to toe drop
    Heel to toe drop
    Men: 6mm
    Women: 6mm

    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.

  • Heel height
    Heel height
    Men: 23mm
    Women: 23mm
  • Forefoot height
    Forefoot height
    Men: 17mm
    Women: 17mm
  • Width
    Men: normal
    Women: normal
  • Release date
    Release date
Show more facts


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.


Expert Reviews

Experts are runners, 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

Show moreless reviews
Apply to become an expert

Updates to Nike 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.

Nike 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.