We spent 6.3 hours reading reviews from experts and users. In summary, this is what runners think:

5 reasons to buy

  • The cushioning systems that are present in the Asics Gel Flux 5 were appreciated by those who have tested it.
  • Most consumers considered this running shoe to be right to size.
  • The color schemes were lauded because it made the façade more eye-catching.
  • The weight of this product was considered to be suitably light.
  • Most purchasers noted that the upper and the sole unit were able to support the shape and motion of the foot.

2 reasons not to buy

  • Some testers claimed that the Gel Flux 5 required an initial break-in period of a few uses before becoming comfortable.
  • The durability of the shoe has been disappointing to some, especially when compared to the previous version of the Gel Flux.

Bottom line

Most runners were happy with the performance of the Asics Gel Flux 5. Some of them welcomed the supportive upper and midsole, while others fawned about its eye-catching design. Moreover, this neutral road shoe was deemed lightweight. On the other hand, there were complaints about a need for a break-in period, as well as problems on durability.


Terrain: Road
Arch support: Neutral
Weight: Men: 11.2oz | Women: 9.1oz
Heel to toe drop: Men: 10mm | Women: 10mm
Pronation: Neutral Pronation
Arch type: High arch
Use: Jogging
Strike Pattern: Heel strike
Distance: Daily running | Long distance | Marathon
Heel height: Men: 23mm | Women: 22mm
Forefoot height: Men: 13mm | Women: 12mm
Brand: Asics
Type: Heavy | Big guy
Width: Men: Normal | Women: Normal, Wide
Price: $80
Colorways: Black, Blue, Grey, Purple
Small True to size Large
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Expert Reviews

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  • The Gel Flux 5 is an Asics running shoe that has a minimalist construction. It moves away from the stitched-overlay-laden configuration of its immediate predecessor, the Gel Flux 4. It now features a set of printed overlays that don’t add bulk to the façade.
  • The midsole unit utilizes a full-length foam to carry the foot throughout the running session. Wedged in the heel and forefoot areas are two Gel® units, silicon-based cushioning pieces that attenuate impact shock during the foot-strike.
  • Carbon rubber and blown rubber are compounds that provide surface traction. While the former acts as a shield against wear and tear, the latter offers additional cushioning through its pliable build.

The Asics Gel Flux 5 makes use of the standard measurements to achieve a true-to-size coverage. So lengthwise, it accommodates the usual choices of consumers. When it comes to width, the options are D – Medium for men and B – Medium for women.

The form-fitting last and upper construction obliges the natural curvature of the human foot.

The forefoot section of the Asics Gel Flux 5 features the DuraSponge, which is made of blown rubber. This material is durable and capable of providing traction, but it also offers some cushioning because it has a soft structure.

Same as with the popular Asics Gel Cumulus 20, the Gel Flux 5's outsole heel section is covered with the AHAR® or the Asics High Abrasion Rubber. It’s a durable compound that’s meant to resist wear and tear while also delivering surface grip.

Flex grooves allow the runner to bend the toe joints efficiently, thus energizing and enabling the toe-off phase of the gait cycle.

SpEVA is a proprietary foam that’s designed to provide responsive cushioning. It transfers kinetic energy to the foot and leg of the wearer, thereby energizing each step.

The heel and forefoot portions of the Asics Gel Flux 5’s platform makes use of the Gel® Cushioning System which is composed of a silicon-based material. Its job is to absorb the impact shock generated by the foot-strike, thus easing the landings.

A vertical groove called Guidance Line leads the foot towards a structurally and mechanically smooth gait transition.

The Guidance Trusstic System is a plastic add-on that bolsters the structural integrity of the midfoot section. It aims to support the foot-pad and ease the tension on the muscles and tendons.

An ethylene vinyl acetate (EVA) sock liner is placed right above the main cushioning foam. This extra layer is intended to keep the foot rested on a soft platform. It can be removed or replaced with a custom insert.

Open Mesh is a material that is soft and flexible. It accommodates the natural shape and motion of the foot. It is also breathable as it has many ventilation pores on its surface.

Printed overlays strengthen the sides of the upper unit. These thin additions are also designed to hug the foot and keep it in place.

A traditional lacing system graces the Asics Gel Flux 5. It makes use of semi-flat shoestrings, non-prominent round eyelets, and printed reinforcements. These elements work together to ensure a snug, secure yet customizable fit.

The padded tongue and collar bring cushioning to the ankles, heel, and instep, and they prevent in-shoe wobbling.


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.