Altra Instinct/Intuition 4.0 Review
The Altra Instinct 4.0 is a much better shoe than the previous 3.5 version, and comes a surprisingly close to my favorite iteration, the 2.0 version. The cushioning-to-weight ratio is pretty much the same as the 2.0, with the 4.0 being slightly lighter, and slightly less cushioned. This version of the Instinct is a smooth riding shoe, with nothing much to interfere with your biomechanics. I do feel that the cushioning is a little less springy than I would like, and feels just slightly dead. The shape matches the human foot nicely, so it doesn't crush your toes, though I do wish there was more height in the toe box. The upper is nicely breathable and open, and it's a comfortable shoe even though it's not got to the excessively padded, skateboard feel that the 2.0 did. I rated the Instinct 4 as "Worth Considering", as it's a good choice, but there are a number of shoes that are better. These reviews are not being maintained. If you want trustworthy and detailed reviews, check out Run Repeat Shoe Reviews. If I'd continued doing running shoe reviews, I'd want to produce a site like run repeat. I used The Science of Running Shoes as the basis of how I tested running shoes and what you should look for in a running shoe.
1 Characteristics
- Cushioning . The Instinct 4 has a reasonable cushioning-to-weight ratio, and it's an improvement on its predecessors. The cushioning is reasonably smooth and even, but I find it a little "dead" and lacking in the bounce. This is particularly noticeable after wearing the Altra Escalante, but that's an exceptional shoe. The latest version is a little closer to my favorite, the Altra Instinct 2, though I know other runners and found that a little too squishy.
- Drop. Like all Altra shoes, the Instinct claims to be zero drop. My measurements indicate that it's actually slightly negative drop, with the forefoot a little thicker than the heel. I doubt if many runners will notice this, and I wouldn't let it put you off if you're off to a zero-drop shoe.
- Structure. The Instinct uses just one density of foam, and doesn't attempt to manipulate or interfere with your natural biomechanics. The midsole is not completely flat, with some rise under the midfoot. I'd say the Instinct 4 has less of a molded shape than most running shoes and you may find it feeling rather flatter than other shoes.
- Flexibility. The Instinct has more flexibility than I expected, and it's similar to the Hoka Clifton, but far more than the other Hoka shoes. However, the flexibility doesn't have much spring to it, which may reduce your Running Economy. Personally, I'd rather have more flexibility or the same flexibility with more spring.
- Outsole. There's a good layer of harder rubber outsole that effectively covers the entire sole of the shoe. There's a few gaps to improve flexibility, but coverage is good. a gap in the outsole near the smaller toes, which is an odd choice, but doesn't cause a problem. The sole of the Instinct does not conform to stony trails in quite the same way that many of the Hoka shoes do, and there's no grip on the outsole, so it's best kept for road running.
- Shape. The Altra Instinct is designed to fit the human foot, and they mostly get it right. The shape is a little overly stylized, and doesn't provide enough room for the big toe to display out. I found that there wasn't quite enough headroom in the toe box and my toes eight after an hour or so. This is another area where the Instinct 2 was better, as the toe box height seems to be reduced with each version. (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 quite breathable, as you can see from the backlit photo below. The ankle opening is fairly well-padded, but doesn't have the extreme adding that the Instinct 2 had that made it feel a little like a skateboarding shoe. There is a reinforcement patch around the extreme front, acting as a toe bumper, but I didn't feel that this impact on my toes. On the other hand, I doubt if it will give much protection from stubbed toes either. For some reason, the grey reflective stripe with the Altra name and logo on it is actually a loop that you could start something into. It's not clear to me what this is for, so let me know in the comments if you have any insight.
- Tongue. The Instinct has a traditional tongue with a tab to attach it to the laces. It's extremely well-padded, but perhaps just a tad short.
- Lacing. The traditional flat laces stayed tied. This is such a simple thing, but it seems like most shoe companies are able to get this wrong.
- Heel Counter. The Instinct has a large, ridged heel counter, but the upper is sufficiently padded to isolate you from this. It's unlikely to have any effect unless you twist your ankle, in which case it could dig in
| 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.
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2 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.
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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.
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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.