Facts

Base model: Merrell All Out Crush
Update:
Terrain: Trail
Arch support: Neutral
Use: Jogging
Weight: Men: 15oz | Women: 15oz
Heel to toe drop: Men: 7mm | Women: 7mm
Pronation: Neutral Pronation
Arch type: High arch
Waterproofing: Water repellent
Strike Pattern: Midfoot strike
Distance: Daily running | Long distance | Marathon
Release date: Jul 2016
Brand: Merrell
Type: Heavy | Big guy | Low drop
Width: Men: Normal | Women: Normal
Price: $110
Colorways: Blue, Grey
Special editions: 1 special editions
Size
Small True to size Large
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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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80 / 100 based on 4 expert reviews

  • 80 / 100 | River Rock Outfitter | Level 1 expert

    If you are looking for a lightweight, responsive trail runner, this is gonna be the way to go.

  • 85 / 100 | Runner's World | Level 5 expert

    Using a mesh upper wrapped in a plastic-like coating, the All Out Crush Shield will keep water out where it belongs in most situations. That construction, however, doesn’t hinder forefoot flexibility—the men’s model bends easiest among all shoes in this guide.

  • 80 / 100 | iRunFar | | Level 4 expert

    What’s new? The upper. It’s got TPU overlays for mud and water shedding along with a breathable tongue that aims to offer protection from morning dew or occasional mud. It’s got a moderately aggressive outsole and a 7mm drop.

  • 70 / 100 | Outside Online | | Level 2 expert

    That said, Shield is a misnomer: the lack of a rock plate made high-alpine jaunts and extended stony stretches distractingly uncomfortable, especially on runs over an hour. 

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  • Merrell brings the water-repellent version of the All Out Crush 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.

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.

Comparison