Arch support
M: 179g | W: 147g
Heel to toe drop
M: 0.0mm | W: 0.0mm
Heel height
M: 23mm | W: 23mm
Forefoot height
M: 23mm | W: 23mm
Widths available
M: Normal - D | W: Normal - B
Show moreless facts


Shoes best for road, track and light gravel. See the best road shoes.


Shoes best for trail, off road, mountains and other unstable surfaces. See the best trail shoes.

Good to know

As long as you stick to the road or path, and if you want just one running shoe, buy a road running shoe.

Neutral / cushion / high arch

Shoes for runners who does not need any additional arch support (Around 50% of runners). Best for people with high or medium high arches. See the best neutral shoes.

Stability / overpronation / normal arch

Shoes for runners who needs arch support (Around 45% of runners). Best for runners with a normal arch. See the best stability shoes.

Motion control / severe overproanation / flat feet

Shoes for runners who needs a lot of arch support. Best for runners with flat feet. See the best motion control shoes.

Good to know

- Rule of thumb: If in doubt, buy neutral shoes to avoid injuries.
- More about arch support in this video.
- Find your arch type by following steps from this video.

Daily running

Cushioned shoes for your daily easy running. Great comfort. See best shoes for daily running.


Lightweight shoes good for races, interval training, tempo runs and fartlek. Here are the best competition running shoes.

Good to know

If you want just one pair of shoes, buy a shoe for daily running.

The height difference from the heel to the forefoot, also known as heel drop, toe spring, heel to toe spring or simply drop.

There are many opinions about what a good heel drop is. We do not recommend any in particular. Lean more in this video.


We spent 7.5 hours reading reviews from experts and users. In summary, this is what runners think:

6 reasons to buy

  • The Quick Dry Air Mesh staves off moisture and provides breathable coverage.

  • Many testers were impressed by the improved durability of the One 2.5.

  • It features a Blown Rubber for better traction, a responsive ride and more flexibility.

  • Runners appreciated the good number of color options for this model.

  • It comes at an affordable price.

  • The mid-sole unit brings responsive cushioning, flexibility, and a balanced platform that’s partially made from recycled materials.

3 reasons not to buy

  • Based on some reviews, the One 2.5 offered less cushioning and less arch support than the previous version.

  • The toe box felt a bit tight for some testers, making their toes clump together uncomfortably.

  • Others pointed out that the heel area was narrow and uncomfortable.

Bottom line

Not many were impressed by the overall enhancement of the Altra One 2.5, but it was able to provide a responsive ride and a more comfortable upper. This shoe is best for tempo running and racing.

World wide, One 2.5 is in the bottom 50% most popular running shoes. The brand, Altra, is the 14th most popular.

Map: Shows popularity per continent based on 1010 shoes


4.5 / 5 based on 257 ratings

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Expert reviews

Experts are running shoe geeks, who post reviews at youtube, directly at RunRepeat or at their own websites. Each expert is categorized from level 1 to level 5 based on expertise. See stats on expert reviews and how we calculate scores here.

Are you an expert? Apply to contribute here.

85 / 100 based on 27 expert reviews

  • 99
    WILLIAM QUICKLevel 1 expert
    Overall, I give this shoe a thumbs up and I definitely recommend it.
  • 99
    Denny KraheLevel 1 expert
    by Denny Krahe
    From the time I put this shoe on, I was just amazed and in love.
  • 90
    Runner's WorldLevel 5 expert
    by Runner's World
    Like the 2.0, this model has more cushioning than the first version, but the foam density in the 2.5 is a hair firmer, providing a more responsive ride that several testers found hit the sweet spot.
  • 84
    Runner's WorldLevel 5 expert
    by Runner's World
    Like the 2.0, this model has more cushioning than the first version, but the foam density in the 2.5 is a hair firmer, providing a more responsive ride that several testers found hit the sweet spot.
  • 60
    FellrnrLevel 5 expert
    by Fellrnr
    there are two problems; the One wears out quickly, making it an expensive shoe in terms of cost per mile, and the best shoes are either lighter or better cushioned (or both.)
  • 98
    Believe in the RunLevel 4 expert
    by Believe in the Run
    The Altra One 2.5 is a super light, super flexible running shoe.
  • 90
    Peter StuartLevel 4 expert
    by Road Trail Run
    The One 2.5 is a great, free, light feeling shoe with enough protection to put miles on it—especially on shorter, faster days—while they’re fun at a loping speed, I really enjoy them when I drop to 7 minute miles.
  • 95
    Nicholas PangLevel 3 expert
    by Wear Tested
    Not a single hot spot or blisters running sockless and extra space in the toe box for maximum splaying!
  • 86
    Brian GoldmanLevel 3 expert
    by Running Without Injuries
    The One 2.5’s are a light weight shoe that was made for speed

  • 85
    Brian GoldmanLevel 3 expert
    by Running Without Injuries
    Its responsive cushioning protects your foot as it impacts the ground and then rebounds to add spring to each step. It’s always nice to have a little bit of a boost, especially when you are tired.
  • 78
    Jonathan SavageLevel 3 expert
    by Fellrnr
    However there are two problems; the One wears out quickly, making it an expensive shoe in terms of cost per mile, and the best shoes are either lighter or better cushioned (or both.)
  • 75
    Stephen RegenoldLevel 3 expert
    by Gear Junkie
    This isn’t a super-cushioned shoe, but it is very fast and light. On mid-distance training runs it feels like there’s nothing there other than a little underfoot padding.
  • 96
    DennyLevel 2 expert
    by DizRuns
    These shoes are pretty amazing, if you’re into light weight, flexible, zero-drop shoes.
  • 95
    Running Into MyselfLevel 2 expert
    by Running Into Myself
    They feel very light and I feel faster in them. They're really cool shoe.
  • 90
    RyanLevel 2 expert
    by Happy Healthy Vegan
    The One 2.5 is a lightweight, lightly cushioned, minimal style running shoe. Highlight features include their Zero Drop design (the heel and forefoot are the same distance from the ground) and the wide "FootShape" toe box.
  • 88
    Bearded Brothers Trail RunningLevel 2 expert
    by Bearded Brothers Trail Running
    A 23mm stack height ensures there is optimum comfort, giving you enough cushioning to hit distances likeZach Bitter did in his 12hour record.
  • 86
    RyanLevel 2 expert
    by Happy Healthy Vegan
    The One 2.5’s distinct niche is their having the lightest cushioning of their neutral shoes, as well as being their lightest shoe – weighing a mere 6.3 ounces (an iPhone 6 weighs 4.5 ounces)!
  • 99
    PlantarFasciitis SurvivalGuideLevel 1 expert
    by PlantarFasciitis SurvivalGuide
    These ones are absolutely perfect and I love them.
  • 99
    RockStarRunnerLevel 1 expert
    by RockStarRunner
    Had really no complains. My feet feel fine. I was pleasantly surprise.
  • 85
    Bart-Eve SmithLevel 1 expert
    by Blue Ridge Runner
    I never felt like I had thatslushy, wet, saturated shoe feeling during the run.
  • 82
    Eric AcunaLevel 1 expert
    by Mud Run Guide
    These shoes are incredibly flexible and lightweight making for a very comfortable run. 
  • 82
    Backpackers.comLevel 1 expert
    by Backpackers.com
    This is bliss for wide-footed people, and just good in terms of anatomy. Nobody wants squashed toes.
  • 80
    Eric AcunaLevel 1 expert
    by Mud Run Guide
    If you’re curious about Altra’s Shoes you can buy them online AltraRunning or just simply try them on at your local sporting good shoe store. Your feet will thank you at the end of a long run.
  • 80
    Becca CapellLevel 1 expert
    by iFit.Blog
    This is my favorite shoe for shorter road runs and any speed work. 
  • 80
    MCM MamaLevel 1 expert
    by MCM Mama Runs
    If you are already wearing zero drop or low drop shoes, but are looking for a cushioned neutral shoe, the Altra One 2.5 is your shoe.
  • 78
    Nick SalazarLevel 1 expert
    by TriRig
    This makes for a very cushy ride and a very light shoe, albeit one that's a bit more sensitive to wear than their training staples like the Instinct and Intuition. 
  • 70
    Matthew KennedyLevel 1 expert
    by The Casual Runner
    There's a lot of wear in the outsole. There's a lot of exposed EVA. Obviously it wear out faster than the rubber but as you can see, the rubber starting to wear. At a 116 miles, I just don't think it should have that much.
  • Show moreless reviews
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These are visual presentations, not reviews

Updates to One 2.5

The Altra One 2.5 redesigned its upper in order to give runners a more comfortable ride. It used light and breathable and quick-drying materials to keep the foot cool and dry.

Another notable update of the One 2.5 was the improved fit. It comes with a wide forefoot area and an asymmetrical lacing design for a secure fit and feel.

The new color options of the Altra One 2.5 are the most visible update of the shoe. They are truly eye-catching and pleasing to the eye.

One 2.5 size and fit

The sizing of the shoe is the usual length like the previous version. Since it has a wider forefoot area and regular measurements on the heel and midfoot, wide-footer and runners with regular foot shape will find a good fit in this version.


The outsole utilizes the FootPOd Technology that maps out the foot’s bones and tendons for the foot to flex naturally. With the maximum flexibility, runners will also enjoy a responsive ride.

Found in the outsole as well is the blown carbon rubber. Aside from enhancing the overall traction of the shoe, it delivers a flexible and responsive ride.


The midsole of the Altra One 2.5 utilizes the Dual Layer EVAthat offers a reasonable amount of cushioning. This works hand-in-hand with the Altra’s A-Bound Technology that provides efficient energy-return and sufficient underfoot cushioning. It reduces ground impact and provides springy feel to each step.

The shoe uses the brand’s InnerFlex Technology, allowing the foot to move freely and flex to where it wants to. This increases the runners’ speed for a much better running performance.

Altra uses its Natural Ride System Technology in the One 2.5. It promotes natural foot movement by allowing the foot mechanisms to work naturally. Natural foot movement is attainable due to the 0 mm heel drop, deep longitudinal grooves and metatarsal pads.

Optimal running comfort was achieved through the Natural Foot Design found in all Altra shoes. This technology follows the natural shape of the foot, allowing the foot to relax and spread naturally. Aside from the comfort it gives, it adds stability and speed.


The upper of the Altra One 2.5 was updated. One f the updates is the use of the Quick Dry Air Mesh that is very lightweight. It is highly breathable, keeping the foot cool and dry. It also has the capacity to wick water away.

Another notable update in the upper is the Asymmetrical Lacing design of the shoe. It follows the natural shape of the foot. The lacing design offers an improved fit and feel.

The shoe also uses a 5-mm removable insole. The contour footbeds were engineered to help runners who need traditional support.


Comparison to category means
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