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

6 reasons to buy

  • A few purchasers mentioned that they liked the comfortable feel of the Merrell Avalaunch Tough Mudder.
  • Some runners admired the wide toe-box of the shoe; it apparently gave the toes enough room to wiggle.
  • A couple of users lauded the lightweight construction of the shoe.
  • According to a few wearers, the shoe provided a good amount of traction while running on the trail.
  • Several runners noted the durable underfoot protection of the shoe that kept their feet well-protected against sharp rocks.
  • The shoe is reasonably-priced, according to a number of reviews.

1 reasons not to buy

  • The shoe is available in limited color options and it disappointed a few runners.

Bottom line

The Merrell Avalaunch Tough Mudder is packed with technologies necessary for trail running. The majority of the users were highly-appreciative of the shoe’s durability, traction, and overall design. This lightweight trail running shoe is best for neutral runners.


Terrain: Trail
Arch support: Neutral
Weight: Men: 9oz | Women: 7oz
Heel to toe drop: Men: 12mm | Women: 12mm
Pronation: Neutral Pronation
Arch type: High arch
Use: Jogging
Features: Slip-on
Strike Pattern: Heel strike
Distance: Daily running | Long distance | Marathon
Heel height: Men: 20mm | Women: 20mm
Forefoot height: Men: 8mm | Women: 8mm
Brand: Merrell
Width: Men: Normal | Women: Normal
Price: $120
Colorways: Orange
Small True to size Large
See more facts

  • The Merrell Avalaunch Tough Mudder features the reliable M-Select™ GRIP technology that is engineered to deliver durable traction while running on the trail.
  • The shoe features the UniFly™ midsole technology. It is strategically placed in the entire midsole to provide better shock absorption and high-energy return, resulting in a responsive ride. This midsole foam also provides a soft underfoot cushioning.
  • The upper of the shoe utilizes a speed-lacing system that makes the lace much easier to adjust to enhance the overall fit and foot lockdown. Along with it is the Bellows tongue that is designed to keep the debris out.
  • Lastly, the shoe features the M Select™ FRESH that reduces the production of odor-causing microbes. It keeps the foot clean, dry, and healthy.

The Avalaunch Tough Mudder has a standard running shoe length. It is available in standard medium width for both men and women’s version. It has a wide toe-box for toe-splay. The neoprene lining in the heel also enhances the overall comfortable fit of the shoe.

The outsole of the shoe utilizes the notable Merrell M-Select™ GRIP technology. It provides reliable traction while running off-road. It also gives durable protection from the aggressive nature of the trail.

The unique configuration of the outsole provides added traction on varied surfaces, while running uphill and downhill.

The Merrell Avalaunch Tough Mudder uses the UniFly™ midsole that is designed to deliver the right amount of cushioning and shock absorption needed for off-road running. It provides a firm feel against the foot for agility and stability.

Integrated into the midsole is the TrailProtect™ pad. It is a thin TPU film that provides added foot protection from sharp rocks and objects.

On the upper of the Avalaunch Tough Mudder is the combination of fabric and mesh materials that provides a breathable coverage, keeping the foot well-ventilated all throughout the run.

The heel collar is lightly padded with a soft neoprene lining that hugs the foot securely for an enhanced comfort.

The Merrel Avalaunch Tough Mudder uses a speed-lacing system. This lacing system facilitates an easy-on and easy-off of the lace.

The shoe also uses a Bellows tongue that is securely attached to the upper on both sides. It is specifically designed to keep the debris out.

Lastly, the shoe utilizes the M Select™ FRESH technology. It provides long-lasting shoe freshness by preventing moisture and sweat from producing any unpleasant odor. The presence of the antimicrobial agent reduces the production of microbes, keeping the foot healthy and odor-free.


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.