58 users: 4.1 / 5
Weight: Men 601g / Women 520g
Use: Day Hiking
Cut: High cut

Verdict from 8.4 hours of research from the internet

6 reasons to buy

  • The T Aenergy High GTX’s lightness stunned a number of users.
  • Several owners considered this Mammut boot insanely breathable.
  • On the comfort front, this day hiker was rated quite highly by a handful of wearers.
  • Some purchasers appreciated the boot’s robust construction.
  • A couple of reviewers found this footgear very stable on unpredictable terrain.
  • Based on a report, the T Aenergy High GTX runs true to size.

1 reasons not to buy

  • Its toe box coming apart after merely tripping on a rock left one owner utterly disappointed.

Bottom line

Surprisingly light yet sturdy—this description is quite befitting of the T Aenergy High GTX. Being astoundingly breathable and comfortable also accurately describe this Mammut hiking boot. There is just one issue surrounding the product that might make some people dismiss it straight away: the allegedly questionable construction of its forefoot zone. Nonetheless, when seen in a positive light, the T Aenergy High GTX can be easily considered a competitor in its class.

Tip: see the best hiking boots.

User reviews:

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  • The T Aenergy High GTX offers a solution to virtually every challenge trail and mountain hikers have. Its board-lasted upper has proper protection against the elements, thanks to Gore-Tex.
  • It is engineered with a Mammut-exclusive sole technology, called Rolling Concept. This patented tech is designed to support and cushion the foot during transitions, thus lessening the risk of ankle injuries and reducing movement fatigue.

A high-cut hiker with a fairly true-to-size fit for men and women is the T Aenergy High GTX. It comes in half and whole sizes in regular width. Giving a no-bunching fit (especially around the instep) and allowing easy on and off is the shoe’s elastic Gore-Tex tongue. What offers a secure and personalized lockdown, on the other hand, is the proprietary Base Fit lacing technology with 2-zone function.

This Mammut boot is equipped with the Vibram Scale outsole for surface traction. It is capable of securing the user’s footing over different types of terrain thanks to its debris-shedding rib-like lugs arranged in a scale-like geometry. It is built with a heel brake—a hook-like feature that claws into steep terrain during descents. It is also engineered with a kind of contour that allows the foot to roll with ease.

Providing hikers with enough balance on rough terrain with as much cushioning and shock mitigation as possible is the footgear’s tapered midsole. It comes with a cushy wedge made of thermoplastic polyurethane, or TPU. Right on top of this sturdy yet springy component is the boot’s default insole for extra comfort underfoot.

The Mammut T Aenergy High GTX’s Hybrid Shell (a.k.a upper) is a combination of durable TPU and abrasion-resistant dropstop textile. It has a rubberized border for added protection. Gore-Tex’s Performance Comfort technology is imbued within its bootie, making the footwear waterproof yet breathable. The boot’s ankle, shin, and instep zones are padded with Memo Foam for an improved comfy fit.

Managing the fit is done through the Base Fit lacing system. Its entirety is comprised of metallic hardware (or eyelets) and round, synthetic laces.

Size and fit

True to size based on 35 user votes
Small (37%)
True to size (63%)
Large (0%)
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How T Aenergy High GTX compares

This shoe: 79
All shoes average: 88
40 99
This shoe: £200
All shoes average: £210
£50 £490
This shoe: 601g
All shoes average: 593g
234g 1220g
Paul Ronto
Paul Ronto

Paul loves adventure. Over the past 20 years, he has climbed, hiked, and ran all over the world. He’s summited peaks throughout the Americas, trekked through Africa, and tested his endurance in 24-hour trail races. He has worked in the outdoor industry as a whitewater and hunting guide, gear tester, copywriter, and outfitting specialist at places like The National Outdoor Leadership School, No Barriers USA, and Sierra Trading Post. He has been quoted in NYMag, NBCNews, and Business Insider to name a few.