Altra One 2.5 Review

The Altra One is a wonderfully light, comfortable shoe that I love to run in. Putting on the One makes me feel like I'm putting on a comfortable slipper rather than a running shoe. 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.) (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.)

Altra The One 2.5 top	Altra The One 2.5 bottom
Altra The One 2.5 inside	Altra The One 2.5 outside

1 Characteristics

• Why you’d buy it. It's a softly cushioned, lightweight shoe that's designed for a human foot. The Hoka Clifton is much better cushioned, but a little heavier, the Asics Gel Hyper Speed is a little better cushioned and a lot lighter.
• Cushioning . The One is softly cushioned, and comfortable underfoot. The cut away parts of the midsole add a bit of an egg crate effect, but not enough to cause problems.
• Drop. In theory Altra shoes are zero drop but I measured a 3mm drop unloaded, which reduces to 2mm when worn, which is close enough to zero drop for most people.
• Structure. This shoe uses single density of foam, but there is quite a bit of shape to the midsole. You might think that "zero drop" means a flat midsole, but it doesn't. There is a fair rise under the arch, though it didn't cause me any problems. The heel is quite cupped, which keeps your foot centered in the shoe without attempting to interfere with your biomechanics.
• Flexibility. The One is a remarkably flexible for shoe due to the deep grooves in the bottom of the midsole, and the shallow grooves in the top. (The top cuts are hidden unless you dissect the shoe.)
• Outsole. 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 helps keep the shoe light as the harder rubber used on shoes is quite heavy. However, the exposed midsole wears very quickly and dramatically, and I've got only a little over 200 miles from mine before they needed retirement. Other shoes seem to do much, much better, even with exposed midsole.
• Shape. 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 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.)
• Upper. The upper is reasonably thin and unpadded in the front, morphing into a thin layer of padding below the ankle opening. The ankle opening itself is nicely padded.
• Tongue. The One 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.
• Lacing. The flat laces work well and remained tied, though they are unusually long. I found they tended to catch on things, so I had to tuck the ends under the laces at the front.
• Heel Counter. There's really nothing you could justify calling a "heel counter", which is nice.

Please support this site 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. Buy Altra One 2.5 at Zappos Buy Altra One 2.5 at Road Runner Sports Buy Altra One 2.5 at Kelly's Running Warehouse Buy Altra One 2.5 at Charlotte Ultra Running Company

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 One

How Altra One compares showing rearfoot cushioning against the performance penalty of its weight. Upper right is better.	How Altra One compares showing forefoot cushioning against the performance penalty of its weight. Upper right is better.
How Altra One compares showing the price against the benefit (cushioning/performance penalty). Upper left is better.	How Altra One compares showing the loaded drop against the benefit (cushioning/performance penalty). Upper left is better.

4 Comparisons

Here are some direct comparisons with its potential competition.

4.1 Altra One 2.5 and One 2

I'm assured the 2.5 is different from the 2, but it's hard to spot the differences. Apparently the upper has been redesigned, but I can't spot anything even on close inspection. The toe box has slightly more height, but it's still woefully short. The 2.5 also has "improved fit", but again, I couldn't spot anything. The biggest change appears to be that the 2.5 comes in different colors, so buy whatever's cheaper. (The sizes have changed; a size 11 in the 2.5 is the same size that a 10.5 was in the 2.0.)

Altra The One 2.5 top	Altra The One 2.5 bottom	Altra The One 2.5 inside	Altra The One 2.5 outside
Altra One2 top	Altra One2 bottom	Altra One2 inside	Altra One2 outside

Please support this site 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. Buy Altra One2 at Zappos Buy Altra One2 at Road Runner Sports Buy Altra One2 at Kelly's Running Warehouse Buy Altra One2 at Charlotte Ultra Running Company

4.2 Altra One and Hoka Clifton 2

I like running in the Altra One, but the Hoka Clifton 2 is a far superior shoe. The Clifton offers vastly more cushioning for only a couple of ounces more weight. However, the One is a lot more slipper like, with more flexibility and a more comfortable upper. It's not that the Clifton is uncomfortable in any conventional way, but because the midsole is so thick and inflexible, the upper has to be more sturdy to keep the shoe attached to your foot. The Clifton is also a lot cheaper shoe in the long run, as even though it has exposed midsole it does not wear as quickly as the One.

Altra The One 2.5 top	Altra The One 2.5 bottom	Altra The One 2.5 inside	Altra The One 2.5 outside
Hoka Clifton 2 top	Hoka Clifton 2 bottom	Hoka Clifton 2 inside	Hoka Clifton 2 outside

Please support this site 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. Buy Hoka Clifton 2 at Zappos Buy Hoka Clifton 2 at Road Runner Sports Buy Hoka Clifton 2 at Kelly's Running Warehouse Buy Hoka Clifton 2 at Charlotte Ultra Running Company

4.3 Altra One and Asics Gel Hyper Speed

The Asics Gel Hyper Speed offers nearly the same forefoot cushioning, and more real cushioning than the One, and it does so at a considerably lighter weight, and it lasts a lot longer. The One is shaped more like the human foot than the Hyper Speed, but I still find I need to cut open the toe box of either shoe. For fast, efficient running I'd always choose the Hyper Speed over the One.

Altra The One 2.5 top	Altra The One 2.5 bottom	Altra The One 2.5 inside	Altra The One 2.5 outside
Asics Gel Hyper Speed 6 top	Asics Gel Hyper Speed 6 bottom	Asics Gel Hyper Speed 6 inside	Asics Gel Hyper Speed 6 outside

Please support this site 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. Buy Asics Gel Hyper Speed 6 at Zappos Buy Asics Gel Hyper Speed 6 at Road Runner Sports Buy Asics Gel Hyper Speed 6 at Kelly's Running Warehouse Buy Asics Gel Hyper Speed 6 at Charlotte Ultra Running Company

4.4 Altra One and New Balance RC5000

Compared with many shoes, the One is lightweight, but it's more than twice the weight of the New Balance RC5000. The RC5000 is the fastest shoe I've tested, providing just enough cushioning to improve Running Economy. The RC5000 suffers from being too cushioned to be a pseudo-barefoot shoe, but not cushioned enough for most runners used to a traditional running shoe. However, if you're efficient enough to be happy with this level of cushioning at your chosen distance, and you're looking for every edge you can get in a race there is nothing else that comes close. By comparison, the One is soft and luxurious. If the One is a Porsche 911 (reasonably fast, but comfortable), then the RC 5000 is a purpose built race car (speed is everything, and forget the comfort.)

Altra The One 2.5 top	Altra The One 2.5 bottom	Altra The One 2.5 inside	Altra The One 2.5 outside
New Balance MRC 5000 top	New Balance MRC 5000 bottom	New Balance MRC 5000 inside	New Balance MRC 5000 outside

Please support this site 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. Buy New Balance RC5000 at Zappos Buy New Balance RC5000 at Road Runner Sports Buy New Balance RC5000 at Kelly's Running Warehouse Buy New Balance RC5000 at Charlotte Ultra Running Company

4.5 Altra One and Asics GT 2000

I tend to compare shoes against my benchmark "normal running shoe", the Asics GT 2000. The GT 2000 is over engineered and these features go against The Science of Running Shoes, causing more problems than they solve. The One stands in stark contrast to the GT 2000, offering better cushioning, greater comfort, with less weight. The One is designed for the human foot, both in shape and function, while it seems like the designers of the GT 2011 never even seen a foot before. Compared with the One, the GT 2000 feels like you're running in a wooden clog.

Altra The One 2.5 top	Altra The One 2.5 bottom	Altra The One 2.5 inside	Altra The One 2.5 outside
Asics GT2000 top	Asics GT2000 bottom	Asics GT2000 inside	Asics GT2000 outside

5 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. Best All Round Shoe. The Altra Escalante is my current all-round favorite. It has plenty of cushioning for its weight, it has a very springy midsole, it lasts well, and it has a shape that's closer to the shape of a human foot than most shoes. It's a great shoe for any runner, including those Starting to run. It's also a fairly easy shoe to find due to its popularity. Best Maximalist Shoe: If you want something massively cushioned, then I'd recommend the Saucony Kinvara 8. It's remarkably light and remarkably cushioned, beating Hoka at their own game. Best Optimal Shoe: For those looking to trade cushioning for speed, the Nike Zoom Streak LT 3 was my top pick, but the latest version (LT 4) falls short of it's predecessor. There are lots of great optimal running shoes, which provide just enough cushioning with light weight and minimal frills, but all have their weak spots. Probably the best option at the moment is the Altra Vanish-R, which offers great cushioning for just over 5oz/150g. Fastest Shoe: If you really want speed, then check out the Nike Vaporfly 4%. It's light, massively cushioned, and has a carbon fiber plate. Nothing comes close, not even the now defunct New Balance RC5000‏‎ or New Balance RC5000v2‏‎. There are a number of caveats; it's really expensive, it's really hard to find, and there's a significant injury risk. Best Minimalist Shoe: Merrell Trail Glove. I recommend the trail glove for road running in spite of the 'trail' moniker. It's not a fast shoe by any means, but it's comfortable and will last well. All Terrain Shoe. For trail running, I've become a fan of Altra, and I think their best shoe is the the Altra Timp, though the Altra Lone Peak is really close. Honorable Mention: It's not really a running shoe, but the Vivobarefoot Ra is comfortable, minimalist and can more or less pass as a dress shoe. I've worn mine to weddings with a suit and they've not looked out of place. You can run in the Ra, but the leather means it doesn't breathe well.

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.

Full Review	Brand	Name	Rating	Recommended price	Benefit	Weight (oz)	Penalty (sec/mile)	Forefoot Thickness	Heel Thickness	Loaded Drop mm	Cushioning	Flexibility
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.