Who should buy the Aku Tengu GTX

The Tengu GTX from Aku was able to demonstrate its readiness for high mountain pursuits. It is a solid option if you:

  • Prefer a mountaineering boot that is ready for high-alpine ascents and climbs.
  • Prefer a mountaineering boot that delivers weather protection and comfort on the trails.
  • Prefer a mountaineering boot that addresses stability and cushioning needed by users.

Aku Tengu GTX logo

Excellent traction

The Aku Tengu GTX features the Vibram Curcuma outsole. Its aggressive studs are widely spaced to shed off accumulated debris, maintaining traction. The defined lugs at the toe area assist during climbs.

Aku Tengu GTX outsole

Excellent heel support

The sole’s undercut heel maximizes the braking power of the boot, especially in steep descents.

Aku Tengu GTX heel

Deliver a shock-absorbing performance

Aku integrates the Internal Midsole System (IMS) into this model to deliver a shock-absorbing performance. It is a technology that forms the sole according to the anatomy of the foot.

Aku Tengu GTX midsole

Offers stability and trail protection

This high-cut backpacking boot also grants a steady and comfy ride through its dual-density PU foam. The medium-density PU uses an Exoskeleton construction to yield stability and trail protection. The lightweight PU, on the other hand, is placed in the inner part of the unit to render cushioning and absorb ground impacts. There are toe and heel inserts that receive crampons.

Aku Tengu GTX midsole 3.0

Excellent arch support

A carbon fiber and die-cut EVA lasting board offer underfoot stiffness. A Custom Fit Pro Alum insole cradles the mountaineer’s foot while providing arch support and a decent amount of insulation.

Aku Tengu GTX arch support

Waterproof and breathable

To provide a durable yet flexible upper, Aku’s engineers designed the Tengu GTX with a combination of nylon and suede. Inside is a moderately insulated Gore-Tex Performance Comfort bootie that helps maintain a fresh environment through water protection and breathability. A Liba Smart PU rand wraps the lower part of the boot which protects it from scuffs and enhances its edging ability.

Aku Tengu GTX upper

Easy to wear

Its lacing system employs webbing loops and riveted hooks. The loop at the ankle area enables users to lock the heel in place (when tightened), preventing slippage. A pull tab is placed at the top of its elastic tongue for easy on and off.

Aku Tengu GTX loop

Facts / Specs

Weight: Men 25.6oz
Cut: High cut
Features: Orthotic friendly / Removable insole / Heel brake
Waterproofing: Waterproof
Width: Normal
BRAND Brand: Aku
Material: PU midsole, Synthetic, Vibram / Leather, Suede

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Paul Ronto
Paul Ronto

Over the past 20 years, Paul has climbed, hiked, and run all over the world. He has summited peaks throughout the Americas, trekked through Africa, and tested his endurance in 24-hour trail races as well as 6 marathons. On average, he runs 30-50 miles a week in the foothills of Northern Colorado. His research is regularly cited in The New York Times, Washington Post, National Geographic, etc. On top of this, Paul is leading the running shoe lab where he cuts shoes apart and analyzes every detail of the shoes that you might buy.