• Discontinued
  • Terrain


    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.

  • Arch support
    Arch support

    Neutral / cushion / high arch

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

    Stability / overpronation / normal arch

    Shoes for runners who need mild to moderate arch support (Around 45% of runners). Best for runners with a low arch. See the best stability shoes.

    Motion control / severe overpronation / 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.

  • Use

    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.

  • Price
  • Weight
    Men: 15oz
    Women: 15oz
  • Heel to toe drop
    Heel to toe drop
    Men: 7mm
    Women: 7mm

    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.

  • Width
    Men: normal
    Women: normal
  • Release date
    Release date
    Jul 2016
  • Special editions
    Special editions
Show more facts


We spent 7.5 hours reading reviews from experts and users. In summary, this is what runners think:

10 reasons to buy

  • According to several reviewers, aside from extremely snowy conditions, the All Out Crush Shield’s water-repellent upper felt efficient when it came to staving off water, as well as dirt and mud.
  • Many consumers thought that the price of this shoe is affordable.
  • The lightweight nature of this shoe was welcomed by a lot of those who have tested it.
  • The drainage ports were able to filter out water with ease, commented some satisfied trail running enthusiasts.
  • The grip capability of the 5mm lugs was lauded.
  • A handful noted that the Shield version of the All Out Crush is quite stylish.
  • The 5mm lugs hold on to soft and mucky conditions.
  • There were persons who appreciated the roomy toe-box, which allowed their toes to splay naturally.
  • More than a few runners valued the arch support coming from the Shield version of the Merrell All Out Crush.
  • A couple of expert reviewers praised the fast turnover through the gait cycle.

4 reasons not to buy

  • Some runners mentioned that the underfoot platform was a bit stiff.
  • Despite the 5mm lugs and the rock protection plate, a handful of testers felt some underfoot pinching when running on rocky ground.
  • The forefoot section of the upper unit felt too wide, according to a several purchasers.
  • The outsole showed early signs of wear and tear, based on the observations of a handful of runners.

Bottom line

The Merrell All Out Crush Shield is the water-repellent version of the standard model. It is marketed to obstacle course lovers and trail runners alike. Merrell designs the shoe for soft and muddy surfaces with all-weather comfort in spades. With a very reasonable price, this is a solid option for those who need a grippy and fast partner that can take the runner from the door to any water-soaked outdoor surfaces.


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.

Are you an expert? Apply to contribute here.

80 / 100 based on 4 expert reviews

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Updates to Merrell All Out Crush Shield

  • Merrell brings the All Out Crush Shield to those who love an all-weather challenge as part of trail running or tackling obstacle courses. With a water repellent upper, the shoe keeps the foot fairly dry and breathable at the same time. In ankle-deep water or heavy downpour, the upper also dries quickly to limit the possibilities of blisters.
  • The 5mm lugs provide leverage on soft or muddy ground. Merrell places the lugs at strategic intervals to prevent mud from caking, which is highly-beneficial when taking on soft or loose ground.
  • Reflective materials on the upper make it an excellent option when visibility is low.

Merrell All Out Crush Shield size and fit

The All Out Shield has a standard fit and hold in the heel and midfoot. It wraps the foot without being restrictive. The toe box is very spacious, which should be excellent for those with bunions or those with inflexible or flat feet. It runs true to size.


Merrell covers the entire section of the outsole with its proprietary M Select Grip for sticky traction, even in wet conditions. There are 5mm lugs that are scattered all over the underfoot, from heel to toe for a superior bite on tricky and wet surfaces. These lugs are also ideally built to handle the challenges of obstacle course racing.


The unique is quite simple as it features only the brand-exclusive UniFly technology, which is a molded foam that has optimal responsiveness and adequate stability. It runs the whole midsole and helps the transition from landing to take-off much smoother. Merrell’s UniFly technology is quite durable despite being very light. The All Out Crush Shield gives a nice mix of cushioning, ground feedback, and pop with every stride because of this foam. A rock protection plate straddles the boundary between the midsole and the outsole for protection against sharp objects on the trail.


Merrell’s typical upper construction is simple and very functional. It has a well-ventilated mesh that is covered with TPU water resistant features. The quick-drying upper is also another asset of this shoe. There are reflective elements for night-time or low-visibility running. A protective toe cap lessens the potential of bruises in the toes. The cushioning and support are enhanced by the presence of a fixed insole.