Altra One2 (One Squared) Review
The Altra One2(One-squared) is a wonderful blend of light weight and soft cushioning, and is a shoe I love to run in. In many ways it reminds me of the legendary Nike Mayfly, though it is not as light weight as that groundbreaking shoe. The One2 is not as softly cushioned as a Maximalist shoe, but it is a lot softer than the Saucony Virrata or the Mizuno Cursoris, and lighter the Adidas Energy Boost. However the One2 does not last very long, making it an expensive shoe in terms of cost per mile. (I use The Science of Running Shoes as the basis of how I test running shoes and what you should look for in a running shoe.)
- Hoka Clifton is better cushioned, but a little heavier. . It's a softly cushioned, lightweight show that's designed for a human foot. The
- Maximalist shoe would. . . The One2is softly cushioned, but because of its thinness it does not offer the same protection from rough ground that a true
- . Like other Altra shoes, the One2 is zero drop but with a slight rise under the arch. The One2 tapers more gently from the ball of the foot to the front than most Altra shoes, mostly because it's so much thinner. The rear of the midsole is very slightly cut away to create a hint of a rocker.
- . This shoe uses single density of foam, but they are deep grooves cut into the bottom of the sole, and some shallower grooves in the top of the midsole. (These top cuts are hidden unless you dissect the shoe.)
- . The One2 is a remarkably flexible for shoe due to the deep grooves in the bottom of the midsole, and the shallow grooves in the top.
- . There is almost no outsole, just a couple of tiny patches of the extreme front and rear of the shoe. The bulk of the bottom of the shoe is exposed foam, which is part of the reason the shoe is so light as the harder rubber used on many shoes is quite heavy. However, this does dramatically reduce the wear characteristics, and I got only a little over 200 miles from mine before they needed retirement.
- I still have to cut the toe box open. (I recommend cutting open the toe box of virtually all running shoes, with the exception of a few shoes like some Altra shoes. When you have some worn out shoes, you should try cutting open the toe box. I've found that it's a big improvement, allowing my toes to move naturally and engage for toe off, as well as reducing the possibility of blisters.) . The shoe is the classic Altra shape, which follows the outline of the human foot much better than other makes. It has a broad toe box, but I find there is not enough height for my toes and
- . The upper is reasonably thin, but more substantial than you would expect from a shoe this light. It has excellent padding around the ankle opening.
- . The One2 has a classic tongue, but it's partially attached on one side to keep it positioned, which I like a lot. It has minimal but adequate padding.
- . The flat laces work well and remained tied.
- . The heel counter is quite soft, and comes as far up the back of the heel as is normal for running shoe.
This review was made possible by readers like you buying products via my links. I buy all the products I review through normal retail channels, which allows me to create unbiased reviews free from the influence of reciprocity, or the need to keep vendors happy. It also ensures I don't get "reviewer specials" that are better than the retail versions.
2 Cushioning and Shoes
It's intuitively obvious that the cushioning in a shoe will reduce the impact on your body when running. However, The Science of Running Shoes indicates that the reality is rather more complex. While slight cushioning may reduce the effort needed to run by improving your Running Economy, most scientific research indicates that more cushioning does further improve Running Economy. In addition, cushioning does not generally reduce impact and may actually increase it. This is counterintuitive, but is likely to be due to the way a runners mind and body adapts to softer cushioning. Unfortunately, the scientific evidence is far from complete and it's hard to give clear recommendations. I believe that some runners will prefer more cushioning, while others prefer less, and typically those running further have a fondness for greater cushioning. I also believe that a shoe should be as light as possible, and a shoe should justify its weight with the cushioning it provides. My advice is to decide what level of cushioning you're looking for, and then find the lightest shoes that also fit well and are comfortable.
3 Visualizing the Attributes of the Altra One2
Here are some direct comparisons with its potential competition.
4.1 One2 and Hoka Clifton
Comparing the One2 and the Hoka Clifton:
- Both are top picks.
- Advantage Altra One2
- . The Altra One2 is a lot lighter, but that lightness is due to less cushioning.
- . The Altra One2 has a much better toe box.
- . The Altra One2 is zero drop though the Clifton drop is smaller than a traditional shoe.
- Advantage Hoka Clifton
- . The Clifton has a lot thicker cushioning.
- . The Clifton has a lot more protection on rocky trails.
- . Both shoes have a lot of exposed midsole, but the Clifton wears much better.
4.2 One2 and Saucony Virrata
Comparing the One2 and Saucony Virrata:
- . Both are light weight.
- . Both are extremely flexible.
- . Both are zero drop.
- . Neither have much grip.
- . Neither last very long, with the exposed midsole wearing quickly enough to make the overall cost per mile quite high. (The Virrata lasts a little longer than the One2.)
- Advantage One2
- . The One2 is more softly cushioned.
- . The One2 has a much better toe box.
- Advantage Saucony Virrata
- . The Virrata is often available at a lower price.
- . The Virrata is easier to find, as Saucony is widely stocked.
4.3 One2 and Mizuno Cursoris
Comparing the One2 and Mizuno Cursoris:
- . Both are light weight.
- . Both are extremely flexible.
- . Both are zero drop.
- . Neither has much grip.
- . Both have great toe boxes (but the Cursoris is slightly better).
- . Neither last very long, with the exposed midsole wearing quickly enough to make the overall cost per mile quite high.
- Advantage One2
- . The One2 is more thickly, softly cushioned, though the Cursoris is pretty good.
- . The Cursoris is hard to get hold of and is discontinued.
- Advantage Mizuno Cursoris
- . The Cursoris is often available at a much lower price (if you can find it).
4.4 One2 and Altra Torin
Comparing the One2 and the Altra Torin:
- . Both are zero drop.
- . Both have good toe boxes.
- Advantage Altra One2
- . The Altra One2 is a lot more softly cushioned.
- . The Altra One2 is lighter.
- . The Altra One2 is a lot more flexible.
- Advantage Altra Torin
- . The Altra Torin has better protection on rocky trails.
- . The Altra Torin lasts a lot longer.
6 A Comparison with other Recommended Shoes
If you're looking for "the best of the best" running shoe, here are my top picks. Of course, the answer will depend a little on what you're looking for, so I have recommendations for various categories.
For a more detailed on running shoes see the Recommendations for Best Running Shoes. This table lists the key attributes of What to Look for in Running Shoes. For more detailed information, on the shoes see detailed shoe comparison.
|Saucony Type A Review||Saucony||A/A7||Recommended||$100||6.4||6.7||12.1||19||22||1||4.3||7|
|Saucony Type A6 Review||Saucony||A6||Highly Recommended||$100||8.2||6.1||9.5||17||21||4||5.0||7|
|Saucony Type A8 Review||Saucony||A8||Highly Recommended||$90||7.5||6.2||9.7||19||20||-1||4.7||7|
|Adidas Adios Boost 2 Review||Adidas||Adios||Worth considering||$140||4.7||8.6||13.4||17||27||11||4.0||6|
|Hoka Bondi 5 Review||Hoka||Bondi||Recommended||$150||6.1||11.6||18.1||38||42||5||7.1||2|
|Hoka Clayton 2 Review||Hoka||Clayton2||Highly Recommended||$150||9.1||8.3||12.9||23||28||1||7.5||5|
|Hoka Clifton 4 Review||Hoka||Clifton4||Worth considering||$130||7.7||9.3||14.5||30||35||10||7.2||3|
|ON Cloudflash Review||On Cloud||Cloudflash||Worth considering||$180||4.4||8.3||14.6||19||26||7||3.7||6|
|On Cloudracer Review||On Cloud||Cloudracer||Worth considering||$130||5.7||8.2||12.8||19||27||5||4.7||7|
|ON Cloud X Review||On Cloud||CloudX||Not recommended||$140||4.5||8.3||16.3||21||27||7||3.8||7|
|Mizuno Wave Cruise Review||Mizuno||Cruise||Worth considering||$120||6.6||5.9||12.5||17||20||7||3.9||6|
|Newton Distance IV Review||Newton||Distance||Worth considering||$155||7.5||9.1||14.2||26||31||3||6.8||5|
|Asics Gel DS Racer 10 Review||Asics||DS Racer||Worth considering||$110||8.2||7.0||10.9||21||26||6||5.8||5|
|Altra Duo Review||Altra||Duo||Recommended||$130||6.0||8.4||13.1||29||29||1||5.0||5|
|Mizuno Wave Ekiden 8 Review||Mizuno||Ekiden||Worth considering||$115||5.7||5.7||14.6||13||18||6||3.2||8|
|Saucony Endorphin 2 Review||Saucony||Endorphin 2||Worth considering||$115||8.0||5.1||9.6||15||13||-1||4.1||8|
|Adidas Energy Boost Review||Adidas||Energy||Worth considering||$160||7.2||10.0||15.6||20||30||7||7.2||5|
|Altra Escalante Review||Altra||Escalante||Best of the Best||$130||9.1||8.7||13.5||28||25||-1||7.9||6|
|Altra Escalante 1.5 Review||Altra||Escalante 1.5||Best of the Best||$130||8.2||9.0||14.0||26||27||-1||7.4||7|
|Saucony Fastwitch Review||Saucony||Fastwitch||Highly Recommended||$90||9.5||7.1||11.1||20||22||4||6.8||7|
|Topo Fli-Lyte 2 Review||Topo||Fli-Lyte2||Highly Recommended||$100||6.7||9.1||14.2||24||26||3||6.1||5|
|Reebok Floatride Run Review||Reebok||Floatride||Worth considering||$150||7.7||9.6||14.9||28||34||10||7.4||5|
|Saucony Freedom Review||Saucony||Freedom||Recommended||$160||5.4||10.7||16.6||25||29||3||5.8||6|
|Skechers GORun 4 Review||Skechers||GORun||Not recommended||$100||6.1||7.5||11.7||15||23||3||4.5||7|
|Skechers GOrun Ultra 2 Review||Skechers||GRU||Worth considering||$90||7.5||10.0||15.6||28||34||8||7.5||4|
|Asics GT 2000 Review||Asics||GT 2000||Not recommended||$120||4.8||11.2||17.4||28||35||5||5.4||2|
|New Balance Hanzo S Review||New Balance||Hanzo||Worth considering||$110||7.6||6.9||10.7||21||19||2||5.2||5|
|Hoka Hupana Review||Hoka||Hupana||Recommended||$115||6.1||8.9||13.9||31||36||7||5.4||4|
|Asics Gel Hyper Speed 7 Review||Asics||Hyper Speed||Highly Recommended||$75||10.9||6.3||9.8||22||26||5||6.8||6|
|Altra Instinct 4.0 Review||Altra||Instinct 4.0||Worth considering||$120||6.0||9.8||15.3||29||25||-1||5.9||5|
|Asics Tarther Kainos 3 Review||Asics||Kainos||Worth considering||$130||10.0||6.9||10.7||17||27||9||6.8||6|
|Altra King MT 1.5 Review||Altra||King MT||Recommended||$140||7.5||10.7||16.7||19||21||3||8.0||5|
|Saucony Kinvara 8 Review||Saucony||Kinvara 8||Best of the Best||$110||9.3||8.6||13.4||26||31||3||8.0||5|
|Altra Lone Peak 3.5 Review||Altra||Lone Peak||Highly Recommended||$120||4.2||11.4||17.7||24||25||4||4.8||5|
|Nike Zoom Streak LT 3 Review||Nike||LT3||Best of the Best||$80||9.8||5.4||8.4||16||21||5||5.3||7|
|Nike Zoom Streak LT 4 Review||Nike||LT4||Recommended||$90||8.5||5.5||8.5||15||21||3||4.6||6|
|Nike LunarSpider R5 Review||Nike||LunarSpider||Recommended||$125||6.9||6.7||10.4||17||21||3||4.6||6|
|Hoka Mafate Speed Review||Hoka||Mafate||Best of the Best||$170||7.6||11.9||18.5||39||40||4||9.0||1|
|Pearl Izumi EM Road N0 v2 Review||Pearl||N0||Highly Recommended||$100||7.9||6.5||10.1||14||20||4||5.2||8|
|Saucony Nomad Review||Saucony||Nomad||Worth considering||$110||4.3||10.5||17.2||25||27||2||4.5||4|
|Hoka Odyssey Review||Hoka||Odyssey||Highly Recommended||$130||8.5||9.4||14.6||37||45||5||8.0||3|
|Altra Olympus 2.5 Review||Altra||Olympus||Highly Recommended||$150||4.6||11.8||18.4||35||34||0||5.4||6|
|Altra One 3.0 Review||Altra||One||Recommended||$100||6.1||8.8||13.7||23||23||0||5.4||6|
|Altra Paradigm 4.0 Review||Altra||Paradigm||Highly Recommended||$150||5.3||11.0||17.1||28||30||5||5.8||8|
|Asics Piranha SP 5 Review||Asics||Piranha||Recommended||$100||10.1||4.2||6.5||11||15||3||4.2||9|
|Brooks PureFlow 5 Review||Brooks||PureFlow||Worth considering||$110||6.0||9.7||15.1||26||29||5||5.8||8|
|Salming Race Review||Salming||Race||Worth considering||$130||6.9||6.5||10.1||16||19||4||4.5||6|
|Altra Escalante Racer Review||Altra||Racer||Highly Recommended||$140||6.6||7.6||11.8||24||26||6||5.0||8|
|New Balance RC1600 v2 Review||New Balance||RC1600||Highly Recommended||$110||8.8||5.6||8.7||15||21||5||4.9||8|
|New Balance RC5000v2 Review||New Balance||RC5000v2||Best of the Best||$125||14.2||4.0||6.2||13||21||6||5.7||7|
|Skechers GoRun Ride 3 Review||Skechers||Ride||Worth considering||$85||5.9||8.5||13.2||18||28||6||5.0||8|
|Nike RN Distance 2 Review||Nike||RNDist2||Worth considering||$120||8.0||9.2||14.3||25||28||4||7.4||7|
|Inov-8 RoadXTreme 220 Review||Inov-8||RXT-220||Worth considering||$120||5.2||8.0||18.2||14||17||3||4.2||8|
|Salomon Sense Ride Review||Salomon||Sense||Worth considering||$120||8.5||10.0||15.6||26||29||6||8.5||0|
|Altra Solstice Review||Altra||Solstice||Highly Recommended||$90||7.1||8.1||12.5||23||25||0||5.7||5|
|Topo ST-2 Review||Topo||ST-2||Highly Recommended||$90||8.2||7.3||11.4||20||18||0||6.0||7|
|Hoka Stinson Lite Review||Hoka||Stinson||Highly Recommended||$160||7.3||11.6||18.1||35||40||6||8.5||0|
|Altra Superior||Altra||Superior||Highly Recommended||$110||5.6||9.9||15.5||21||25||-1||5.5||4|
|Adidas Takumi Sen 3 Review||Adidas||Takumi Sen 3||Highly Recommended||$160||7.7||6.6||10.2||17||21||4||5.1||5|
|Topo Terraventure||Topo||Terraventure||Review Pending||$110||2.6||10.8||27.5||24||24||0||2.8||10|
|Altra Timp Review||Altra||Timp||Best of the Best||$130||3.7||11.6||18.1||30||31||-1||4.3||6|
|Altra Torin 2.0 Review||Altra||Torin||Worth considering||$125||3.4||9.6||20.7||30||25||1||3.3||9|
|Altra Torin 3.5 Review||Altra||Torin 3.5||Worth considering||$125||5.8||9.3||14.5||27||28||0||5.4||8|
|Hoka Tracer Review||Hoka||Tracer||Recommended||$130||7.2||7.4||11.5||21||24||2||5.3||5|
|Merrell Trail Glove 4 Review||Merrell||Trail Glove 4||Best of the Best||$100||3.4||8.4||23.8||13||13||0||2.8||10|
|Topo Tribute Review||Topo||Tribute||Recommended||$100||5.9||7.3||11.4||20||18||-1||4.3||6|
|Mizuno Wave Universe 5 Review||Mizuno||Universe||Highly Recommended||$125||10.7||3.1||10.6||9||12||1||3.3||9|
|Altra Vanish-R Review||Altra||Vanish-R||Recommended||$100||16.1||5.3||8.2||19||21||4||8.5||6|
|Merrell Vapor Glove 3 Review||Merrell||Vapor Glove 3||Highly Recommended||$85||2.1||6.1||27.6||6||5||0||1.3||10|
|Nike Vaporfly 4% Review||Nike||Vaporfly||Best of the Best||$250||10.4||7.2||11.2||25||37||8||7.5||2|
|New Balance Vazee Pace Review||New Balance||Vazee Pace||Worth considering||$110||6.0||8.6||13.4||18||24||6||5.2||5|
|Asics TartherZeal 3 Review||Asics||Zeal||Worth considering||$140||10.9||6.3||9.8||17||27||9||6.8||6|
|Saucony Zealot 3 Review||Saucony||Zealot3||Recommended||$130||8.9||9.5||14.8||29||32||4||8.5||6|
|Nike Zoom Fly Review||Nike||Zoom Fly||Worth considering||$150||8.3||8.7||13.5||29||36||8||7.2||3|
It's not a running shoe, but I love the Hoka Tor Ultra hiking boot and I've tested the Altra Lone Peak Boot, the Hoka Tor Speed 2, and the Inov-8 Roclite 325 hiking boots
Older shoe reviews: Saucony Hattori Review, Mizuno Cursoris Review, Skechers GO Bionic 2 Review, Hoka Clifton Review, Saucony Virrata 2 Review, Brooks PureCadence 3 Review, Brooks PureConnect 3 Review, Brooks PureFlow 3 Review, Skechers GO Bionic 2 Review, New Balance 980 Review, Brooks Transcend 2 Review, Hoka Huaka Review, Patagonia EVERlong Review, Asics 33-DFA Review, Hoka Conquest Review, Saucony Cortana Review, Puma Faas 100 R Review, Saucony Fastwitch Review, Nike Free Review, Asics Gel Lyte 33 Review, Skechers GOmeb Speed Review, Skechers GOrun Ultra Road Review, Nike LunaRacer Review, Altra Paradigm Review.