• 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

    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: 9oz
    Women: 7oz
  • Heel to toe drop
    Men: 12mm
    Women: 12mm

    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.

  • Heel height
    Men: 20mm
    Women: 20mm
  • Forefoot height
    Men: 8mm
    Women: 8mm
  • Width
    Men: normal
    Women: normal
  • Release date
Show more facts


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.

2 reasons not to buy

  • Based on the response of some wearers, the Avalaunch Tough Mudder is half-a-size larger compared to what they were used to.
  • 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.


Updates to Merrell Avalaunch Tough Mudder

  • 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.

Merrell Avalaunch Tough Mudder size and fit

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.