Arch support
Daily running
Water repellent
M: 299g | W: 255g
Heel to toe drop
M: 6mm | W: 6mm
Heel height
M: 24mm | W: 24mm
Forefoot height
M: 18mm | W: 18mm
Widths available
M: Normal - D | W: Normal - B
Show moreless facts


Shoes best for road, track and light gravel. See the best road shoes.


Shoes best for trail, off road, mountains and other unstable surfaces. See the best trail shoes.

Good to know

As long as you stick to the road or path, and if you want just one running shoe, buy a road running shoe.

Neutral / cushion / high arch

Shoes for runners who does not need any additional arch support (Around 50% of runners). Best for people with high or medium high arches. See the best neutral shoes.

Stability / overpronation / normal arch

Shoes for runners who needs arch support (Around 45% of runners). Best for runners with a normal arch. See the best stability shoes.

Motion control / severe overproanation / flat feet

Shoes for runners who needs a lot of arch support. Best for runners with flat feet. See the best motion control shoes.

Good to know

- Rule of thumb: If in doubt, buy neutral shoes to avoid injuries.
- More about arch support in this video.
- Find your arch type by following steps from this video.

Daily running

Cushioned shoes for your daily easy running. Great comfort. See best shoes for daily running.


Lightweight shoes good for races, interval training, tempo runs and fartlek. Here are the best competition running shoes.

Good to know

If you want just one pair of shoes, buy a shoe for daily running.

The height difference from the heel to the forefoot, also known as heel drop, toe spring, heel to toe spring or simply drop.

There are many opinions about what a good heel drop is. We do not recommend any in particular. Lean more in this video.


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.

  • 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.

3 reasons not to buy

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

  • The size runs large.

  • 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. It is a great neutral running shoe for daily training.

World wide, All Out Terra Trail is in the bottom 50% most popular running shoes. The brand, Merrell, is the 12th most popular.

Map: Shows popularity per continent based on 1010 shoes


4.4 / 5 based on 98 ratings

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Expert reviews

Experts are running shoe geeks, 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.

Are you an expert? Apply to contribute here.

83 / 100 based on 8 expert reviews

  • 87
    Paul Cuno-BoothLevel 3 expert
    by Trail Runner Magazine
    A great shoe for the worst conditions: sloppy trails, rocky scrambles, brambly bushwhacks and the like.
  • 80
    Top Ten ReviewsLevel 2 expert
    by Top Ten Reviews
    This model is a better choice for moderate distances rather than long jaunts over extended runs.
  • 91
    Sami MughalLevel 1 expert
    by OxGadget
    Warm, comfortable, and a grip that works in all terrains means these boys tick all the boxes.
  • 85
    David WiseLevel 1 expert
    by David Wise
    The sock feature is amazing and it truly does keep the stones, twigs and dirt out as you run.
  • 82
    BenLevel 1 expert
    by Gear Exposure
    If Merrell could shave-off some of the weight while keeping the protection it would be even better.
  • 81
    Fiona OutdoorsLevel 1 expert
    by Fiona Outdoors
    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
    Danielle SellwoodLevel 1 expert
    by SportSister
    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.
  • 76
    Matt KleinLevel 1 expert
    by Gear Guide
    Although the grip was decent, the shoe provides almost no stability.
  • Show moreless reviews
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These are visual presentations, not reviews

  • Nelly Shop Zappos
    These are super lightweight and they're quite flexible, and it's all on a Vibram rubber outsole.
  • Richard Shop Zappos
    These shoes have a 100% vegan-friendly construction. The upper is made out of a durable mesh and polyurethane material, with this lace-up closure to lock your foot in.
  • TV Walk Tall

Updates to All Out Terra Trail

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.

All Out Terra Trail size and fit

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 bootie-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.


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