Adidas Adizero Adios Boost 2 Review

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The Adidas Adios has a new material in the midsole (see 'Adidas Boost Foam' below) which has more spring and lasts longer than conventional foam. However, unlike the Adidas Energy Boost, the Adios is thinner and lacks the immediate comfort of the Energy. The Adios is a traditional design, with the heel raised 11mm above the forefoot, more than the Asics GT 2000, a shoe I consider the epitome of traditional shoe design. The Adios confirms the potential of the Boost foam, if only Adidas could design a descent shoe around it. I've rated the Adios as "worth considering." (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.)

Adios Boost 2 top
Adios Boost 2 bottom
Adios Boost 2 inside
Adios Boost 2 outside

1 Characteristics

  • Why you’d buy it. If you can tolerate the 11mm drop, you're a heel striker and you're after a shoe that will last a long time, consider the Adios.
  • Cushioning . The Adios has limited cushioning, especially in the forefoot where it's similar to a shoe that I'd consider minimalist. The large drop means that the heel is better cushioned, though still very poor for its weight. The outsole wraps around the inside of the heel, creating a pseudo-medial post. This reduces the cushioning on the inside of the heel and I found it a little uncomfortable. However, the Boost material gives more spring than the equivalent conventional EVA foam.
  • Drop. The Adios has an appalling 11mm of drop, which made it hard for me to run in them. Running in high heels tends to move my initial contact point back, so I become a heel striker in these shoes.
  • Structure. This shoe uses single density of foam, but there are features that create biomechanical interference. There is the outsole that wraps around the inside edge of the heel and a plastic plate that pushes up under the arch area.
  • Flexibility. The thin forefoot gives the Adios good flexibility.
  • Outsole. There is a hard rubber covering most of the contact area of the shoe, which improves longevity. There are also hard plastic nodules in the middle of the forefoot that improves grip on asphalt.
  • Shape. The Adios doesn't come close to matching the shape of the human foot, so cutting open the toe box is important. (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 inflexible and rather thick, with worse breathability than many other shoes. There's no padding in the upper except a little around the ankle opening, but at least the upper is largely seamless.
  • Tongue. The Adios has a traditional tongue that is has a tab to attach it to the laces, with a little padding.
  • Lacing. The flat laces work well and remained tied.
  • Heel Counter. The heel counter is external, but remarkably hard. The Adios is one of the few shoes I've tried where I've found the heel counter slightly uncomfortable.
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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 Adidas Adios Boost

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

4 Adidas Boost Foam

The Adios uses a new type of foam in the sole that has more bounce and is more resilient. Adidas demonstrates this extra bounce by dropping a steel ball on their new foam and EVA, the industry standard foam. Because of the extra energy return in their new foam the ball will bounce much higher than on EVA. However, when we run our feet do not bounce off the ground, but have a short period of sustained contact, often called the 'stance phase'. So when your foot lands, it seems that the boost foam would return the landing shock back up your leg rather than absorbing it, which is less than ideal. It would be good to see a study that looks at how the boost foam changes the stresses on knees and hips compared with a standard running shoe. Regardless of how the bounce impacts your running, the increased lifespan of the new foam is appealing. Having a shoe that lasts longer is obviously good, but Adidas also claim that the new foam is more consistent through most of its lifespan, rather than gradually decaying in the way EVA does. Adidas also claims that their new foam does not change characteristics in extreme temperatures like EVA does.

Adidas Adios Boost. The foam used in this shoe looks a little like Styrofoam/polystyrene, but it's actually remarkably tough to cut. You can also see a small indent in the top of the midsole where the foot pod would go.

5 A Comparison with other Recommended Shoes

For a more detailed comparison of these 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 A6 Review Saucony A6 Highly Recommended $100 8.2 6.1 9.5 17 21 4 5.0 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 Cloudracer Review On Cloud Cloudracer Worth considering $130 5.7 8.2 12.8 19 27 5 4.7 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
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
Saucony Fastwitch Review Saucony Fastwitch Highly Recommended $90 9.5 7.1 11.1 20 22 4 6.8 7
Topo Fli-Lyte 2 Topo Fli-Lyte2 Review Pending $100 6.7 9.1 14.2 24 26 3 6.1 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
Saucony Kinvara 8 Review Saucony Kinvara 8 Best of the Best $110 9.3 8.6 13.4 26 31 3 8.0 5
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 One 3.0 Review Altra One Recommended $100 6.1 8.8 13.7 23 23 0 5.4 6
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
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 Nike RNDist2 Review Pending $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
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
Nike Zoom Streak LT 3 Review Nike Streak LT Best of the Best $80 8.8 5.4 8.4 16 21 4 4.8 5
Adidas Takumi Sen 3 Review Adidas Takumi Sen 3 Highly Recommended $160 7.7 6.6 10.2 17 21 4 5.1 5
Altra Torin 2.0 Review Altra Torin Worth considering $125 5.8 9.6 14.9 28 25 -1 5.5 4
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
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 Review Pending $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 Saucony Zealot3 Review Pending $130 8.9 9.5 14.8 29 32 4 8.5 6
Hoka Clifton Review Hoka ZZ Clifton Best of the Best $130 9.5 8.2 12.8 28 32 4 7.8 4

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,

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