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New Balance Fresh Foam Hierro v6 Review Analysis (2022)

New Balance Fresh Foam Hierro v6

Last update: August 2022

The New Balance Fresh Foam Hierro v6 is a sleek trail running shoe built for comfort.

The Consensus

9Overall score
Comfortable and stylish all-round trail running shoe
Have you ever pegged New Balance as a brand for trail shoes? If your answer is no, you might want to reconsider! The new Hierro v6 is a solid upgrade for the series that is not only about looks: it delivers comfort and performance!

Let’s discuss the thick, Fresh Foam X midsole for a second—because it’s built for comfort. With an even blend of cushion and responsiveness, the midsole is designed to absorb the shock of off-road debris and gravel. Impressively, the Hierro 6 is protective without using a rock plate, ensuring a comfortable and safe ride. Meanwhile, the shoe’s upper is much improved from previous versions and is made with sustainable materials as a bonus. It cradles the top of the foot with a snugness that locks feet in place. The fit is true to size. Lastly, the durable outsole uses Vibram MegaGrip material, which proves effectively grippy yet versatile on various surfaces. While it may not be the best option for soft terrains, it will do well in most situations.

Users of the Hierro v6 were overall happy with the way it performed. The only major complaint was weight, a prerequisite to most trail shoes. The v6 is no exception and weighs 337 g/11.9 oz, which is a lot, though this model shed 20 grams/0.7 oz from its predecessor. Also, while the shoe can technically double for road and trail use, its performance is subpar on flat pavement. It’s likely due to larger lugs, making the shoe optimal for more technical terrain.

Overall, New Balance’s latest Hierro model is a comfortable option that performs well in most conditions. Version 6 can go the distance smoothly and—the cherry on top—can retire as a sleek sneaker once its trail career is over.
Value for money
  • Comfortable shoe
  • Improved upper that provides better lockdown
  • Snappy ride
  • Stylish design
  • Still a bit heavy despite shedding some weight



  • Vibram MegaGrip: a rugged and naturally sticky rubber that provides safe traction on technical trail terrains.
  • The lugs optimize grip on trails to effortlessly handle the most perilous conditions. Those rubber parts are multidirectional with an aggressive design.
New Balance Fresh Foam Hierro v6 rubber outsole lugs


  • The Fresh Foam X midsole reduces impacts and maximizes the energy return for fluid heel to toe transitions.
  • The laser engravings on the side of the midsole aim to make the platform more flexible without weakening the structure.


  • The upper of the New Balance Fresh Foam Hierro v6 is a synthetic mesh with TPU zones that comfortably keeps the foot secure inside the shoe while providing a good breeze when the running gets tough.
  • The bootie design promotes targeted and adaptive foot support. It also reduces irritation and chaffing and makes it easy to take off and put on the shoes.
  • Toe Protect acts as a shield for the forefoot against potentially harmful bumps on the trails.


Technical Specs

Pronation typeNeutral
Drop8 mm
Heel stack height28 mm
Forefoot stack height20 mm
FeaturesRecycled materials, Toe cap
Weight (men)337 g/11.9 oz
Weight (women)280 g/9.9 oz
Release year2021


Softness (1-5)4 – Soft
Bounce (1-5)3 – Moderate


OutsoleVibram MegaGrip, lugs
MidsoleFresh Foam X, laser engravings
UpperSynthetic mesh with TPU zones, bootie design, Toe Protect


DistanceMid, long
WorkoutDaily runs

Reference: New Balance’s official website

Frequently Asked Questions (FAQs)

Does the New Balance Fresh Foam Hierro v6 fit true to size?

Yes, athletes who ran with the shoe confirmed that it fits as expected. Therefore, you can order your standard size for running shoes. Nonetheless, if this is your very first pair of New Balance shoes, it’s better to try them on in a shop to make sure you find the most comfortable size for you.

Is the New Balance Fresh Foam Hierro v6 good if I’m a heavy athlete (187 lbs/85 kg or more)?

Yes, this shoe is fine, even if you’re a heavyweight runner. Indeed, The New Balance Fresh Foam Hierro v6 has a stack height of 28 mm under the heel, which is enough to support most athletes, so you can use it regardless of how much you weigh.

Is the New Balance Fresh Foam Hierro v6 adapted to run an ultramarathon?

With its comfortable cushioning, adequate grip, and precise foot lockdown, the Hierro v6 is a good candidate for long-distance trail running. As for the ultramarathon, it’s a matter of personal preference. If you’re considering this model for your race, the best solution is to add it to your training shoe rotation. If you experience no issues after a few long runs on various terrains, then you’ve got your shoe!

Kevin Le Gall

Kevin Le Gall

Kevin is the founder and editor of Runner's Lab. He started running in 2015 and completed his first marathon in Rotterdam in 2016. He's also worked for Under Armour from 2016 to 2018 and helped launch their running collection in Europe (in particular the HOVR shoes). In addition, Kevin is a 300-hour certified yoga teacher (Sivananda) and uses this experience to run more mindfully with a focus on well-being over performance.

1 thought on “New Balance Fresh Foam Hierro v6”

  1. Great review. I have 4 pairs of the Hierro V6 and everything they say about them is true. Super cushioning fresh foam X , grippy vibram sole, no need for a rock plate, versatile go anywhere shoe. I use them for road to trail running and especially on easy days because the cushioning is great for sore feet…..feels slipper soft!
    Only con in my opinion is the heel flipper which I cut off with a utility knife. The shoe looks better without it and I have noticed zero traction issues.


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