We spent 10.2 hours reading reviews from experts and users. In summary, this is what runners think:

6 reasons to buy

  • Many people appreciated the stylish and appealing design of the Nike Flex RN 2018.
  • Runners were generally appreciative of the shoe’s lightweight construction.
  • More than a handful said that the shoe is comfortable, with some detailing that it feels like "walking on clouds."
  • The shoe offers enough amount of arch support, said a few users.
  • The Nike Flex RN 2018 is affordable.
  • A lot of buyers agree that the shoe is well-cushioned and springy.

3 reasons not to buy

  • Various reviewers claim the shoe feels like it was made with cheap materials.
  • The shoe has a narrow fit in terms of width, said a few disappointed users.
  • The upper material is criticized for being flimsy, especially by some wearers who experienced their big shoe almost poking out of the shoe.

Bottom line

The majority of the users highly recommend the Nike Flex RN 2018 because of its appealing design, comfortable fit, and lightweight design. The affordable price and excellent performance of the shoe overshadowed the few negative comments on the shoe’s fit and sizing. In summary, the 2018 version of the shoe is indeed a successful release.


Update: Nike Flex RN 2019
Terrain: Road
Arch support: Neutral
Weight: Men: 9oz | Women: 7oz
Heel to toe drop: Men: 6mm | Women: 6mm
Pronation: Neutral Pronation
Arch type: High arch
Use: Jogging
Material: Vegan
Strike Pattern: Midfoot strike
Distance: Daily running | Long distance | Marathon
Brand: Nike
Type: Low drop
Width: Men: Normal | Women: Normal
Price: $85
Colorways: Beige, Black, Blue, Grey, Multi, Orange, Pink, Red, White
Special editions: 1 special editions
Small True to size Large
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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.

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  • The Nike Flex RN 2018 features a few updates in the upper and in the outer sole. The improvements aim to deliver a responsive and flexible ride without affecting the fit and the breathability of the upper.
  • A circular-knit material has been used in this version to replace the engineered mesh found in the upper of the Flex RN 2017. The circular-knit construction offers flexibility without compromising breathability and comfort.
  • The outsole of the shoe has been modified as well for durability, traction, and flexibility. It uses the same rubber material but with a new placement and tread pattern.

Nike offers this version in standard running shoe length and width. The knit upper is designed to accommodate a wide range of foot shapes – medium-footed and slightly wide feet. However, some users observed that it runs small and narrow. The Nike Flex RN 2018 is available in standard D-Medium for men’s and B-Medium for women’s.

The outsole of the Nike Flex RN 2018 is made up of a rubber material, which is specifically placed in high wear areas. The sections of rubber tread in the forefoot and heel area offers durability and reliable traction for a wide variety of paved surfaces.

The Tri-star pattern in the outsole offers flexibility without affecting the cushioning. The grooves follow the natural movement of the foot through the gait cycle.

In the midsole of the Nike Flex RN 2018 is the dual-density Phylon foam. This durable and lightweight midsole foam extends from the heel to the forefoot, giving the foot a reliable cushioning throughout the run. Aside from giving runners a comfortable platform, the Phylon foam also delivers a flexible, responsive ride. The Phylon foam is also present in the Nike Downshifter 7 and other road running shoes from Nike.

Above the Phylon foam is the minimal, molded textile footbed. It gives additional underfoot cushioning, especially to areas that are not usually cushioned.

The Nike Flex RN 2018 has a circular-knit upper for maximum breathability. It is impressively stretchable, giving the foot a comfortable wrap. It allows the foot to move comfortably as it flexes in every step.

The shoe has a lightly padded tongue and collar for comfort. The synthetic overlays deliver an enhanced fit, and breathable fabric lining offers a great in-shoe feel.

Lastly, the Flex RN 2018 has a reliable lace-up closure. For an adaptive and supportive feel, the Flywire cables are attached to the laces.


Jens Jakob Andersen

Jens Jakob is a fan of short distances with a 5K PR at 15:58 minutes. Based on 35 million race results, he's among the fastest 0.2% runners. Jens Jakob previously owned a running store, when he was also a competitive runner. His work is regularly featured in The New York Times, Washington Post, BBC and the likes as well as peer-reviewed journals. Finally, he has been a guest on +30 podcasts on running.