Verdict from 100+ user reviews

5 reasons to buy

  • A good number of shoppers find the shoe’s design to be adorable.
  • Most users describe it as a comfortable trainer.
  • It has served well for moderate exercise and walking, as stated by some testers.
  • Several wearers have taken note of this pair’s lightweight nature.
  • A few buyers consider the shoe flexible enough to accommodate natural foot movement.

2 reasons not to buy

  • Some wearers have been put off by the heel strap. It tends to pull down the material at the back, causing the shoe to slip off.
  • Others feel uncomfortable because the edges of the tongue curl under.

Bottom line

The Nike Flex TR 9 is a decent option for those who need an affordable yet stylish trainer for low-impact workouts.

Tip: see the best training shoes.

Good to know

Continuing the line of lightweight training shoes for ladies, the Nike Flex TR 9 comes is a refreshed design for upgraded looks and performance. This shoe is crafted for low-impact yet intensive exercises such as circuit training. Created to be light and highly flexible, the trainer offers a secure foot containment without hindering the natural movement.

The Flex TR 9 from Nike is created for the shape and size of a female foot and, thus, is offered in women’s sizes only. The available range comes in both full and half sizes, from US 5 to 12. The shoe can be purchased in a standard B - Medium width. It tends to run true to size and fit, so it is safe to select your regular training shoe size when purchasing.

The platform of the Flex TR 9 is made of a single unit called Nike Flex. It is engineered to be responsive and flexible, and yet durable enough to serve as both the midsole and the outsole. Having one component do the job for the two helps to significantly reduce the weight of the footwear.

The foam material creates a cushiony underfoot experience for the wearer. Even though it is not meant for hard, high-impact foot landings, it keeps the foot safe and sound during moderately-paced workouts. 

The word “Flex” has been placed into the shoe’s name for a good reason. The bottom side of the sole features Nike’s proprietary Tri-Star groove patterns. These geometrical cut-outs make the unit expand when pressure is applied. That way, the foot receives a certain amount of impact protection along with the freedom to bend and flex in multiple directions.

Rubber pods are strategically placed in the forefoot and heel areas of the sole. They provide extra wear-resistance in these areas while also helping the foot grip the floor. Traction is further enhanced by the sharp textures found throughout the unit.

Those who favor the benefits of a lightweight and flexible Nike Flex sole can also check out the Nike Flex Supreme TR 6. This women’s trainer features the same sole design with a different upper style.

Nike has stripped down the upper of the Flex TR 9 to make it as light and breathable as possible. Now synthetic overlays are only present on the heel and around the eyelets, giving structure and protection to these areas.

The sturdy fabric heel strap wraps the rearfoot section for added support. Part of it makes a zig-zag turn under the material and then shows up at the top to form an additional eyelet for the laces. Once the shoestrings are tightened, the strap pulls up the entire hindfoot section of the shoe, enhancing support. The extended heel collar also contributes to keeping the heel securely in place throughout the movement.


How Nike Flex TR 9 ranks compared to all other shoes
Bottom 44% workout training shoes
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Bottom 44% Nike training shoes
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Bottom 41% cross-training training shoes
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The current trend of Nike Flex TR 9.
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Nicholas Rizzo
Nicholas Rizzo

Nick combines 10+ years of experience in the health and fitness industry and a background in the sciences in his role as the Fitness Research Director. During his competitive powerlifting years his PRs have him sitting in the top 2% of bench presses (395 lbs), top 3% of squats (485 lbs) and top 6% of deadlifts (515 lbs) for his weight and age. His work has been featured on, LiveStrong, Healthline, WebMD, WashingtonPost, and many more. Along the way, collaborating with industry leaders like Michael Yessis, Mark Rippetoe, Carlo Buzzichelli, Dave Tate, Ray Williams, and Joel Seedman.