Verdict from 8.2 hours of research from the internet

51 users: 4.4 / 5
4 experts: 86 / 100

5 reasons to buy

  • People are happy to call the Merrell MTL Long Sky a lightweight running shoe for all-day use.
  • Several users have observed a well-ventilated ride because of the open construction of the mesh upper.
  • The traction given by the outsole unit is deemed highly efficient and confidence-boosting, particularly on rugged paths.
  • Consumers are saying that the underfoot experience is stable and agreeable to the foot.
  • Based on some reviews, the in-shoe wrap is apparently secure and non-irritating to the skin.

2 reasons not to buy

  • The aggressive nature of the outsole prevents this product from being steady on flat ground.
  • The individual lugs are quick to wear off, according to a few consumers.

Bottom line

The MTL Long Sky aims to become a reliable ultra marathon shoe that can handle the irregular terrains. This Merrell trail running shoe features an underfoot platform that is ready for the trails. Also, it brings stability into the picture with a medial post that prevents and /or corrects overpronation. A breathable and secure wrap can also be enjoyed when it comes to this model.

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Anatomical steadiness and injury-free running sessions are integral parts of the existence of the Merrell MTL Long Sky. This stability running shoe is not for the roads, though, as it has been configured to handle the off-road paths. Yes, it has a medial post for pronation correction, but it can still encourage speed and natural performance on the unpredictable outdoor environments.

The standard sizing measurements have been used during the creation of the Merrell MTL Long Sky. Runners are welcome to use the size options with which they are most comfortable to allow themselves to enjoy an in-shoe experience that is agreeable. However, being able to enjoy a wrap that follows personal expectations may be influenced by personal testing of the shoe and/or observation of other users’ feedback regarding the aspect of size.

The outsole unit of the Merrell MTL Long Sky features the Vibram® Megagrip, a rubber compound that is touted to be durable and grippy. It covers the heel and forefoot sections of the midsole foam, shielding them from the abrasive nature of the trails.

Heightened traction is afforded by the opposite-facing, arrow-pattern gripping lugs that pockmark the external pad. These elements act like claws that adhere to the ground during the run. The clamping action that they do is meant to ensure the steadiness and sureness of the step.

EVA or ethylene-vinyl acetate is the compound that is used for the midsole unit of the Merrell MTL Long Sky. This technology is tasked with providing comfort to the foot, carrying it through the gait cycle in a supportive fashion. It also mitigates impact shock and gives back energy to the foot for the toe-off phase. EVA is a reliable underfoot technology that is used by other trail-optimized series such as the Hoka One One Challenger ATR.

A unique aspect of this product’s midsole design is the medial post. This high-density piece is incorporated into the medial side of the platform, and it is tasked with providing stability to the foot. It averts overpronation by neutralizing any excessive inward rolling of the foot, but it doesn’t jut out like an unwelcome piece.

An open-structure mesh is used for the upper unit of this trail running shoe. This element offers a secure wrap while also permitting breathability to be enjoyed by the wearer.

A set of thermoplastic polyurethane (TPU) prints acts as a means of improving durability and supportive mechanics. These layers don’t have a hefty weight or a bulky nature.

Reflective elements permit this product to be visible in low-light. Nighttime speed exercises through the local park can become enjoyable and safe excursions thanks to these add-ons.

Size and fit

True to size based on 27 user votes
Small (0%)
True to size (88%)
Large (11%)
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Forefoot fit
Narrow Wide
Heel fit
Narrow Wide
Tight Roomy

How MTL Long Sky compares

This shoe: 85
All shoes average: 85
58 99
This shoe: $130
All shoes average: $130
$60 $250
This shoe: 9.9oz
All shoes average: 10.4oz
5oz 24oz
Jens Jakob Andersen
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.