Mammut Aenergy Trail Endurance Ultra Low Review | Comfort That Goes The Distance

The Aenergy Trail Endurance Ultra Low is exactly what you would expect from a European mountaineering brand: it is designed for high performance on long days of technical terrain.

I put them to the test on a couple of longer runs, including a few off-trail adventures up 12ers and 13ers in Colorado and Wyoming, and was seriously impressed.

If you’re looking for a new shoe to keep your feet happy during long runs and ultras, look no further.

This shoe is great for long days on mountain trails where comfort is key.

Mammut Aenergy Trail Endurance Ultra Low Overview

Usually, when I test a new pair of shoes, I alternate them with another pair that I already know works for me to minimize any blisters or weird muscle imbalances. But the Aenergy Trail Endurance Ultra Low felt like home right out of the box.

I wore them exclusively for every run for almost a month, including longer runs (10-14 miles) and some off-trail mountain adventures.

I’m not in a season of running fast right now, but from a few strides and singletrack zoomies, it was apparent to me: speed is not where this shoe shines. Although this shoe is designed with a rocker profile and a midsole promoting high energy return, I honestly didn’t notice any of it.

And I’m ok with that.

This is a shoe that is made for long runs. Full stop. Sometimes you get to the end of a long run, and your feet feel bruised and beat up; that has never been the case for me in these shoes – even after miles of varying off-trail terrain (from tundra to talus).

I finished every run with my feet feeling brand new.

I haven’t loved a long run shoe since the Brooks Cascadia 15… until now.

As much as I want to love how these look, I can’t help but think of dad shoes while wearing them – even after they got a little dirty.

Mammut Aenergy Trail Endurance Ultra Low Fit

Length: Runs small (consider sizing up)
Width: Standard
Toe Box: Roomy
Arch: Moderate
Volume: High

These shoes run small – I had to exchange them for a larger size (made even more confusing by the Euro ⅔ size increments).

Once I had the right size, they were immediately comfortable and required no break-in whatsoever.

The toe box is really roomy; I often have to re-lace my shoes to prevent my toes from going numb, but I was able to use the lacing pattern out of the box.

The midfoot is higher volume than most European shoes I’ve tried, which was actually a lot for my narrow feet.

Because of the soft cushion and higher-volume midfoot, I experienced a lot of lateral movement inside of the shoe, especially on terrain that was a little off-kilter.

I have a pretty narrow foot, so maybe someone with a “regular” foot wouldn’t have this problem, but I don’t feel like this is a wide shoe.

Mammut Aenergy Trail Endurance Ultra Low Feel

This is a high (8 mm) drop, high-cushion shoe that’s all about comfort.

From my first run in the Aenergy Trail Endurance Ultra Low, I observed that the cushion felt like my foot was standing on a Tempur-Pedic mattress; it turns out Mammut actually uses memory foam in the heel to help lock it down.

While my heels feel very secure in these shoes, the cushion serves more to absorb shock than to propel forward. Although the CORE Plus and CORE Ultra midsoles are designed for maximum energy return and the shoe theoretically has a rocker profile, I have not found this shoe to be responsive at all.

This would not be my choice for speedwork or shorter races when I needed to run fast.

I’m not sure if it’s due to the shoe or a concussion this spring affecting my coordination, but I have felt like I trip over a lot of rocks in these shoes – to the point that I chose not to wear them in a technical trail race. At least the toe box is reinforced – the shoes are no worse for wear despite being bashed into about 300 rocks.

Honestly, on a long run, I care way more about comfort than speed, so this shoe still checks all the boxes for a super comfortable shoe for long days on trail.

While the Aenergy Trail Endurance Ultra Low is far from perfect, as a long run shoe, it’s pretty dang close. Mammut also makes several other shoes in the Aenergy line, including a speed shoe and an all-mountain shoe, so if speed is important to you, you’d be better served by one of those options.

But not every shoe has to do it all. The Aenergy Trail Endurance Ultra Low is the perfect shoe for long runs that require all-day comfort.

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