Merrell MTL Adapt Matrix First Impressions: A Deeply Cushioned Trail Shoe That Runs Better Than It Looks

Introduction

Over the years, a couple of trail running shoes have stood out as genuine favourites: the original Exodus Ultra from Sockin, which handled everything from training miles to tough races like Endure 24 and the TDS at UTMB, and Merrell’s Agility Peak 5, a shoe that balanced comfort, performance, cushioning, and connection better than most. So when Merrell launched the MTL Adapt Matrix, a wild-looking, deeply cushioned trail shoe, there was genuine curiosity mixed with a little scepticism. The one lesson learned from years of testing shoes: never judge a book by its cover. After an 8-mile first run across coastal cliffs, gravel paths, tarmac, and technical woodland trails, this shoe proved that lesson all over again.

Specs and Construction

The MTL Adapt Matrix retails for £170 on the Merrell website, and a UK 9.5 pair weighs in at 305g per shoe territory, with the tested pair coming in at a reasonable weight given the huge midsole. The stack sits at 30mm in the heel and 24mm at the forefoot, giving a 6mm drop. The upper borrows heavily from the Agility Peak 5, with a thin gusseted tongue, a soft plush internal liner, an elasticated lace keeper at the midfoot to stow laces away from snags, and moderate padding around the ankle collar and heel cup. The black mesh liner that made the Agility Peak 5 so breathable and quick to shed water on wet, boggy runs also returns here.

The headline difference is the matrix upper construction, combining multifilament threads of Kevlar and a high-density polyamide into a single layer of material that is lightweight, breathable, and abrasion resistant. Merrell has added 3D-printed and TPU overlays in the high-wear areas around the heel, toe box, and lace eyelets, plus high-visibility detailing on the toe and heel for safer night running, and a toe bumper up front for protection when you clip a rock at speed.

First Run: 8 Miles on Mixed Terrain

The test route covered compacted trails, gravel and loose pathways, some tarmac, and technical woodland sections, and the MTL Adapt Matrix soaked up the smoother stuff with ease. That kind of runnable, flowing terrain is exactly where this shoe belongs. On fit, they run true to size, with just the right length in the toe box at UK 9.5. The upper feels remarkably similar to the Agility Peak 5: a secure lockdown around the midfoot and a great hold in the heel.

The toe box is not overly wide. It posed no problem for a medium-width foot, but runners with wider forefeet may struggle in this upper. If you like a roomy, wide toe box in your trail shoes, this is probably not the best option for you.

Midsole and Ride Feel

The midsole is a bit of an optical illusion. The foot sits sunk down inside the Flex Connect midsole, which uses Merrell’s Float Pro foam, so you are not riding as high as the shoe looks. That foam is not super soft: it returns good energy while keeping you planted and stable on more technical trails, offering that balance between comfort and connection rather than a squishy, disconnected ride.

The midfoot does feel stiff out of the box, and the flex grooves cut across the midsole do not seem to change that much. In practice, though, the stiffness never became noticeable on the run. Combined with the slightly rockered geometry, the shoe felt efficient, responsive, and surprisingly nimble on rooted, technical woodland sections, encouraging a quicker cadence and an easy 7:30 to 7:45 per mile pace through the trees. A bumpy, off-camber path hidden under long grass, normally a section that would inspire a walk in a deeply cushioned shoe, was handled without hesitation.

Grip and Outsole Performance

Underfoot, you get Vibram Mega Grip rubber paired with a 4mm lug traction pattern. This compound is dominating the trail running scene for good reason: it is super sticky on rocky and wet rocky trails and genuinely confidence boosting when footing matters. Lug depth is only 4mm, but the design and layout of the lugs do a decent job in mud, as long as conditions are not too wet and boggy.

Who This Shoe Is For

The MTL Adapt Matrix is ideal for trail runners who want a deeply cushioned shoe that still delivers connection and stability, and for anyone who already loves the Agility Peak 5 fit and feel. It looks well suited to long distances and longer races, thanks to a comfortable, secure, highly breathable upper and a midsole that balances comfort, protection, and ground feel. The main caveat is that it fits and performs very similarly to the Agility Peak 5, so Merrell now has two shoes in its trail lineup that do much the same job. With whispers of an Agility Peak 6 on the way, that may change soon.

Buying Advice

If you already own and love the Agility Peak 5, consider whether you need a near-identical second shoe before buying. If you are new to Merrell trail shoes, or you want a max-cushion option that does not sacrifice ground feel, the MTL Adapt Matrix is an easy recommendation. Try them on if you have a wider forefoot, and look elsewhere if a roomy toe box is non-negotiable. At £170, they sit at the premium end of the trail shoe market, so it is worth being sure the fit suits your foot shape.

Conclusion

The Merrell MTL Adapt Matrix turned out to be one of the more pleasant surprises of the year. The bonkers-looking midsole raised expectations of a stiff, disconnected ride, but the reality was a comfortable, efficient, surprisingly nimble trail shoe with a superb upper and confidence-inspiring grip. Longer test runs are next on the list, and if they hold up as well as this first outing, these could earn a place at the start line of some big races.