5.956 users: 4.6 / 5
4 experts: 96 / 100
Weight: Men 319g / Women 283g
Use: Speed Hiking
Cut: Low cut
Features: Lightweight / Breathable / Orthotic friendly

Verdict from 8.8 hours of research from the internet

6 reasons to buy

  • Droves of users are in awe because of how breathable the Merrell All Out Blaze Aero Sport is.
  • According to a majority of adventurers, it is indeed a gratifyingly comfortable hiking shoe.
  • A handful of buyers state that this Merrell product dries quickly after being exposed to water.
  • This shoe’s lightweight construction is a boon on the trail, based on a bunch of All Out Blaze Aero Sport’ reviews.
  • Several customers love the arch support of this speed hiker.
  • A minority of shoppers commend the outsole’s grip on slippery terrain.

3 reasons not to buy

  • According to some outdoor enthusiasts, its mesh upper is susceptible to scuffs and abrasive elements.
  • A couple of wearers says that sand and debris can get inside the Merrell All Out Blaze Aero Sport easily.
  • A few purchasers are not happy with the shoe’s non-removable footbed.

Bottom line

This Merrell shoe for speed hikers manages to capture the attention of the outdoor community, thanks to its breathability and comfort. Those who have used it also laud its lightness and quick-drying properties.

However,  its susceptibility to abrasion might come off as a letdown for male and female adventurers. All in all, alleged durability issues aside, the Merrell All Out Blaze Aero Sport remains an interesting option, both for water and speed hiking, thanks to its set of positive qualities.

Tip: see the best hiking shoes.

Expert reviews:

User reviews:

SportsShoes, REI and 19 other shops don't have user reviews

-The All Out Blaze Aero Sport is a Merrell below-the-ankle shoe designed to help speed hikers perform outdoors. Its vegan-friendly synthetic upper is treated with the brand’s patented M Select Fresh to prevent an unpleasant odor from being produced.

-Outdoor lovers are given ample cushioning, thanks to the footgear’s UniFly midsole. Its Vibram outsole, meanwhile, helps users stay balanced when traversing all sorts of ground conditions.

The Merrell All Out Blaze Aero Sport is a low-top shoe engineered for men and women. It uses a proprietary Omni-Fit lacing system, which grants a customized and glove-like lockdown. A molded counter made of thermoplastic polyurethane (TPU) is found at the rearfoot zone to lock the wearer’s heel down.

This Merrell shoe for outdoor enthusiasts comes with a Vibram outsole. It uses a pattern of 5mm rectangular and oval-shaped lugs along its profile grip on a wide variety of surfaces. It has a central channel, which helps disperse water and debris for optimal traction. The outsole’s rear end houses several grooves to give added control when going downhill. Its front tip extends upward to prevent the user’s toes from getting stubbed.

The Merrell All Out Blaze Aero Sport is able to supply speed hikers with cushioning, thanks to its UniFly midsole. It is made of a foam material with shock-absorbing pads positioned in the heel and forefoot zones. This trademarked technology also yields rebound and stability. Moreover, the shoe’s footbed grants extra arch support and comfort underfoot.

The Merrell All Out Blaze is equipped with a vegan-friendly upper made of synthetic fabric. It is lined with a layer of mesh, granting breathability for warm environments. Its forefoot region contains a rubberized cap for added robustness and trail protection.

This Merrell offering uses a series of fabric loops and metal eyelets to manage its fit. This lacing system is connected to a counter at the rearfoot area for added heel support. The shoe comes with a bellows tongue to prevent debris from entering it. Moreover, a pull tab is found at the back to facilitate easy on and off.

Speed hikers may consider both the Adidas Terrex AX3 and the All Out Blaze Aero Sport for their adventures. These lightweight below-the-ankle shoes are geared towards those who want to move fast on the trail. They also come with various features that help individuals perform in this kind of outdoor activity. Shown below are several qualities that differentiate these offerings apart.

Upper. The Adidas Terrex AX3 uses a mesh upper reinforced with synthetic overlays. It is lined with soft textile fabric, granting the user a comfortable and breathable in-shoe environment. The forefoot zone houses a molded thermoplastic polyurethane (TPU) cap to render protection from accidental bumps. The Merrell All Out Blaze Aero Sport is also breathable with its upper made of synthetic material. Unlike the Terrex AX3, this shoe, however, is quick-drying. This feature makes it an effective water hiking shoe.

Weight. The Merrell All Out Blaze is slightly lighter than the Terrex AX3. 

Closure. The Adidas Terrex AX3 is able to give wearers a personalized fit, thanks to its quick lacing system. It employs a series of loops and eyelets to facilitate fit management. Meanwhile, the Merrell All Out Blaze Aero Sport is equipped with a conventional lacing system, which allows users to have a customized fit.

Outsole. Adidas furnished the Terrex AX3 with a Continental outsole to help users traverse tricky surfaces. It uses an aggressive lug pattern, which bites down on most types of terrain. A heel brake is incorporated into its design for added descent control. The Merrell All Out Blaze Aero Sport gives these grip-centric benefits, via its Vibram rubber outsole.

  • Outdoor lovers who are in need of an above-the-ankle hiker may do well with a pair of hiking boots. One example that might be of interest is the Teva Terra Fi Lite.
  • Those who require durability, support, and protection during a multi-day excursion may want to check a pair of backpacking boots out. Among the options that may be considered are the Lowa Camino GTX and Salomon Quest 4D 3 GTX.

Size and fit

True to size based on 3105 user votes
Small (9%)
True to size (78%)
Large (12%)
Add rating

Calculate size

Size comments

These shoes fit pretty true to size, there is a pinch point at the tongue that would cause some issues on a long hike.. - Amazon
Tight Loose

How All Out Blaze Aero Sport compares

This shoe: 97
All shoes average: 86
60 99
This shoe: £110
All shoes average: £130
£50 £240
This shoe: 319g
All shoes average: 394g
185g 660g
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.