We spent 9 hours reading reviews from experts and users. In summary, this is what runners think:

5 reasons to buy

  • The Merrell All Out Terra Trail has a deep-lugged Vibram outsole for reliable grip while running on loose surfaces, according to a few testers.
  • Most runners took note of the reflective details of the shoe that increases visibility when running on low light.
  • The majority of the runners found the All Out Terra Trail to be durable and comfortable.
  • Some runners were impressed by the design of this shoe.
  • The toe box of the All Out Terra Trail is roomy.

2 reasons not to buy

  • Some runners found the inner sock uncomfortable because it rubs on the ankle.
  • Moderately expensive.

Bottom line

The Merrell All Out Terra Trail provides impressive 360° protection from debris and rocks while running on rough terrain. It comes with a built-in sock liner for added protection. The shoe is ideal for neutral runners who are looking for a lightweight yet reliable trail shoe.


Terrain: Trail
Arch support: Neutral
Weight: Men: 10.5oz | Women: 9oz
Heel to toe drop: Men: 6mm | Women: 6mm
Pronation: Neutral Pronation
Arch type: High arch
Use: Jogging
Features: Slip-on
Strike Pattern: Midfoot strike
Distance: Daily running | Long distance | Marathon
Heel height: Men: 24mm | Women: 24mm
Forefoot height: Men: 18mm | Women: 18mm
Brand: Merrell
Type: Low drop
Width: Men: Normal | Women: Normal
Price: $120
Colorways: Black, Blue, Green, Orange, Red
Small True to size Large
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A top rated Trail running shoe
It has never been more popular than this April

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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83 / 100 based on 7 expert reviews

  • 87 / 100 | Trail Runner Magazine | | Level 3 expert

    A great shoe for the worst conditions: sloppy trails, rocky scrambles, brambly bushwhacks and the like.

  • 80 / 100 | Top Ten Reviews | Level 2 expert

    This model is a better choice for moderate distances rather than long jaunts over extended runs.

  • 91 / 100 | OxGadget | | Level 1 expert

    Warm, comfortable, and a grip that works in all terrains means these boys tick all the boxes.

  • 82 / 100 | Gear Exposure | | Level 1 expert

    If Merrell could shave-off some of the weight while keeping the protection it would be even better.

  • 81 / 100 | Fiona Outdoors | Level 1 expert

    I found them to offer enough cushioning so that I didn’t feel rocks and stones under my feet yet not so cushioned that I didn’t feel “in touch” with the terrain.

  • 78 / 100 | SportSister | | Level 1 expert

    It’s not really a bad point but you do need to choose the right socks because of the high ankle cuff, it’s not a big deal, but worth trying a couple of different pairs to get the most compatible fit.

Become an expert

  • Based on the name itself, Merrell offers a shoe that lets the runner go all out without any inhibition in the Terra Trail. The rugged and durable design with superior grip on a multitude of trail surfaces takes the runner’s experience in the outdoors to a more enthralling level.
  • Merrell slightly deviates from its renowned mastery in making minimalist trail shoes as the All Out Terra Trail is fitted with adequate cushioning, superior trail protection scheme, and more structure and support. Despite the substantial support and structure, it runs nimbler and lighter than the weight shoes. There is also good enough flexibility and ground feedback that minimalist runners will likely enjoy.
  • Merrell also comes up with a new inner sock that improves the wraparound comfort and secured feel of this shoe. Additionally, this plush inner sock helps with the shoe’s ability to keep off trail debris from getting inside the shoe.

Merrell’s signature snug heel and midfoot with a roomy toe box is very evident in the All Out Terra Trail. While the snug fit enhances the need to pick up speed, the ample room in the forefoot gives that plush feel and caters to the needs of runners with different foot dimensions. The available width is medium for this shoe. Sizing is regular with choices for the men’s starting from 6 to 15 while the women’s are from 5 to 12.

Merrell sticks with the tried and tested Vibram outsole that utilizes diamond shaped lugs all over the outsole for superior grip on grass, mud, rocks, and technical trail. Just above the outsole is a flexible but sturdy Trail Protect Plate that prevents sharp objects from making an impact in the underfoot.

The UniFly midsole continues to drive most of the trail shoes in Merrell’s fold. It is made of high-quality EVA with company exclusive technologies to produce a lightweight foam with exceptional shock dispersing features and moderate cushioning.

The upper is made of synthetic AirMesh for excellent breathability. As this is made of high-quality material, the upper guarantees a long-lasting performance. There are also several synthetic overlays in the midfoot and just around the heel for superior locked down feel and support. Merrell’s cleatie-style construction of the upper helps with the anti-debris characteristics of the shoe and adds a dose of stability by holding the heel firmly in place. More than just plush comfort, the interior of the shoe is very healthy courtesy of the M Select lining that wicks moisture away and fights off odor. The Removable Microfiber Footbed adds step-in comfort, cushioning, and is made of Aegis material for its anti-microbial properties.


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.