Verdict from 1 expert and 100+ user reviews

7 reasons to buy

  • The Merrell Agility Peak Flex 3 is very comfortable even on long walks, said some users.
  • According to some reviews, the shoe offers a great level of support and stability.
  • Many runners agreed that the shoe fits well, from the heel to the forefoot.
  • Several buyers lauded the shoes durable construction.
  • A few wearers noticed the upper wraps the foot snugly.
  • The Agility Peak Flex 3 offers durable traction on varied surfaces, based on some user reviews.
  • Most runners lauded the shoe’s responsive cushioning.

1 reason not to buy

  • It is slightly expensive.

Bottom line

The Merrell Agility Peak Flex 3 is a reliable trail running shoe designed for neutral pronators. It received positive reviews from users because of its quality design, comfortable upper and responsive cushioning. Though it is slightly expensive compared to other trail shoes, the Agility Peak Flex 3 is still a good option for those who are looking for a high-mileage running shoe.

Tip: see the best trail running shoes.

Good to know

  • The Merrell Agility Peak Flex 3, a vegan-friendly running shoe, features several updates from the upper to the outer sole. The upgrades are meant to help runners survive the trail no matter the distance.
  • The upper of the shoe features a Jacquard mesh that is durable and breathable at the same time. It provides the foot a comfortable and well-ventilated coverage, which is very essential when running on warm conditions.
  • Along with the new mesh upper is the TPU overlays the provides foot security while enhancing structural durability.
  • The outsole also features the Vibram Megagrip material that is also used in other Merrell running shoes. It aims to provide durability and grip. It is configured to withstand soft and hard trail surfaces.

When it comes to sizing, the Agility Peak Flex 3 runs true to size. It has a medium fit in the forefoot, heel, and midfoot areas. It can comfortably accommodate foot with medium measurements. It is available in standard D-Medium and B-Medium for men’s and women’s versions. Wide-footed runners should consider going one size up to get the right fit.

In the outsole of the Merrell Agility Peak Flex 3 is the notable Vibram Megagrip, which is also used in other trail running shoes. This rubber compound is a well-known material in the running world because of the durability and traction it gives. This Vibram Megagrip is strategically placed from the heel to the forefoot.

The outsole of this shoe is also configured with flex grooves, which are designed to provide flexibility without sacrificing cushioning and durability.

The 3rd version of the Agility Peak Flex also features a very responsive cushioning. It uses a compression molded EVA that also delivers high-energy return and long-lasting underfoot comfort.

For midsole flexibility, the shoe uses the FLEXconnect technology. It is a midsole technology which is composed of flex grooves that are designed to deliver flexibility and speedy ride on uneven terrain.

The TraiProtect rock plate is also placed between the midsole and outsole. It aims to provide durable underfoot protection from sharp rocks and other trail debris.

For added cushioning and increased responsiveness, the shoe also uses a removable PU insole.

The shoe has the M Select Fresh anti-microbial agents to provide the foot an odor-free wrap. It also reduced the presence of microbes, making the shoe clean and fresh.

In the upper of the Merrell Agility Peak Flex 3 is the new Jacquard mesh upper that provides the foot a comfortable, glove-like fit. It also delivers a lightweight and durable foot coverage. Along with the breathable upper is the mesh lining that also provides the foot a smooth in-shoe feel.

The Hyperlock TPU film heel counter offers comfortable heel security while the TPU overlays provide enhanced fit and added structural integrity.


How Merrell Agility Peak Flex 3 ranks compared to all other shoes
Bottom 48% trail running shoes
All trail running shoes
Top 40% Merrell running shoes
All Merrell running shoes
Bottom 25% maximalist running shoes
All maximalist running shoes


The current trend of Merrell Agility Peak Flex 3.
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Jens Jakob Andersen
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.