Who should buy the Allburds Tree Runners

This extra comfy option from Allbirds is a perfect choice if you need the following:

  • a shoe for all-day wear that feels like a bedroom slipper
  • extra light footwear for traveling that can be squeezed into a carry-on
  • a highly sustainable product


Who should NOT buy the shoe

Even though it’s partially made of wool, this Allbirds shoe doesn’t do well in colder temperatures. Consider the Allbirds Wool Runners for chilly weather instead. And if you expect lots of rain or snow, the Wool Runner Mizzles will be a better option.

The Tree Runners is also NOT meant for running. Yes, it’s got the word “Runners” in its name which can be misleading but it is in fact a dedicated walking shoe. For running, see the Allbirds Tree Dasher.


Keeps your feet fresh and odor-free

The wearers gave lots of positive feedback regarding the shoe’s thermoregulating and odor-reducing materials. Made of breathable eucalyptus fiber, it lets the heat escape easily. As one reviewer shares, “in 85-degree weather, my feet stayed completely dry and odor-free.”

Fact check

In our smoke test, we found that the Tree Runner is actually not the most breathable shoe on the spectrum. On a 1-5 scale where 5 is the most breathable, we rated the shoe with 3. For comparison, the Tree Dasher is a much more breathable option with a score of 5.

Allbirds Tree Runners (left), Adidas Runfalcon (right)

Fact check

On the bright side, the ventilation pores are spread all throughout the upper, helping to create a consistent airflow.

Fact check

In addition, the shoe has a very thin tongue (only 1.2 mm) which prevents the interiors from getting too warm. For reference, the average tongue thickness on athletic shoes is 5.8 mm.


Socks or no socks - you decide

The majority of reviewers agree that the Tree Runner can be worn either way. The merino wool works wonders with comfort and moisture-wicking. “Consistently the freshest-smelling shoes we have in the repertoire,” claims one of the buyers.

However, some people still do recommend wearing light socks if your feet are especially prone to sweating and odor.


Allbirds Tree Runners can fit into any scenario

Knocking around the house, having lunch with friends, walking around the office, standing on feet all day - the Tree Runners have got you covered for all of these occasions and many more.

It has also made a great reputation as a travel shoe. It is lightweight, easily packable, doesn’t take up much space in the bag, keeps you cozy on the plane, and is very easy to slip on and off at security checks.

Remains comfortable for many hours on end

The Allbirds Tree Runner has become a go-to for people who want one cozy shoe to put on in the morning and forget all about it until they go to bed. Here are some of their comments:

  • “Allbirds absolutely shine in this regard”
  • “haven’t had any soreness from wearing the Tree Runners”
  • “supportive enough to keep feet pain-free”

As for the nature of the sole, opinions are split about whether it’s soft enough. While some say that it is “fairly spongy and provides a nice amount of cushion,” others find it “surprisingly stiff” wishing for more plushness.

Fact check

Based on our durometer measurements, the Tree Runner strikes a balance between the two. It is 11% firmer than the Tree Dasher but 10% softer than the Wool Runner.


Disclaimer: We take all our measurements 5 times prior to noting down the results to ensure accuracy. The photo shows the last measurement.

Fact check

The shoe also packs a good amount of underfoot foam for extended periods of walking. We measured the heel stack at 31.1 mm which is the average for athletic shoes.


Fact check

In the forefoot, the midsole is thinner at 18 mm. This creates a pretty noticeable heel-to-toe drop of 13.1 mm. In normal people speak, this means that your heel gets plenty of cushioning for impact protection as you land your foot on it with each step.


Padded insole feels like a cloud

The insole of the Allbirds Tree Runners received lots of love from the reviewers. It is also covered with merino wool for a more pleasant sensation.

One of the wearers refers to it as “the most heavily padded part of the shoe.”

Fact check

The insole is indeed quite heavily padded. At 7.2 mm, it is 38% thicker compared to the average of insoles in running shoes!


Great news is that the insole is easily removable. It can be replaced with a new one from Allbirds for $15 to extend your pair's life.

Unbelievably flexible!

The shoe's extra bendy sole can make you feel like you are walking barefoot, only protected from stepping on sharp objects.

Fact check

Our resistance check of the Allbirds Tree Runners shows phenomenal results. It is 60% more flexible than our lab-tested shoes. Only shoes like Nike Free and Nike Flex can compete with the Allbirds in that regard.

Fact check

In our manual assessment of flexibility on a 1-5 scale where 1 is the most flexible, the Tree Runners received a solid 1 for both torsional and longitudinal flex.

Tree Runner is not a shoe for flat feet

Because of how pliable the shoe is, it doesn't make a very stable platform for people with flat feet, overpronation, or any other foot conditions which require additional arch support.

Good thing the insole is easily removable and can be replaced with custom orthotics.

So light you barely feel it

“Light as air,” says one of the shoe's wearers. A lot of people are happy with the lightness of this Allbirds shoe which makes you forget about wearing a shoe in the first place.

Fact check

Tipping the scales at 8.6 oz (245 g) in a men's US 9, it is 22% lighter than walking shoes on average.


True to size with no breaking in

Based on the general feedback, the Allbirds Tree Runner requires no break-in period and feels comfortable from the off. The majority of reviewers also describe it as true to size.


Fact check

The shoe's toebox is very accommodating for average-to-wide feet. In its widest part, we measured the shoe's toebox at 99.1 mm.


Fact check

We measured the internal length of the shoe to be 260.7 mm in a men's US 8 size. This corresponds to Allbirds' official size chart where the US 8 equates to 260 mm.


Tip for the ladies: If you can't find the Tree Runner in your size or don't like the colorway, you can opt for the men's version in a smaller size. Go down 1.5 US size from your women's Allbird size.

Can last for years with moderate use

As long as you don't put the shoe through the wringer or take it hiking, the Allbirds Tree Runner is going to serve you more than one season. According to some of the reviewers, they managed to get three years of use out of the shoe.

Fact check

Given the absence of an extra rubber layer at the bottom, this Allbirds shoe is going to be more prone to wearing out. Another factor that detracts from longevity is the level of density at the bottom of the shoe.

We measured the latter to be 23% softer than the average of shoes with rubber outsoles. So, it's better to avoid going hard on the shoe if you hope to wear it for a long time.


Grip is alright on dry surfaces

The shoe is going to keep you surefooted on concrete, asphalt, rubberized floors, tile floors, etc., as long as all of these are dry. This is definitely not the type of outsole that will do well on wet.

One positive aspect of it though is that the Tree Runner seems to be rather quiet on smooth surfaces, according to an expert.


Allbirds shoes love the planet

Sustainable manufacturing lies at the core of the Allbirds brand. A great number of wearers were more than happy to join the environmentally conscious crowd when purchasing a pair of Tree Runners.

Nearly every piece of the shoe is made of a responsibly sourced material, including:

  • sugarcane-based SweetFoam sole
  • eucalyptus tree fiber upper
  • Merino wool heel lining
  • castor bean oil-based footbed
  • laces made of recycled plastic bottles

The shoe also prides itself on having a carbon footprint of 6.77 kg CO2e.


Minimalist design that's easy to style

The majority of buyers appreciated the simplistic vibe of this Allbirds shoe. However, some people still found it too bland, underwhelming, and even boring.

But for minimalism purists, the Tree Runner has become a real gem. They absolutely adore its "wear-with-everything classic style" and subtle branding. More than a few people reported getting compliments from strangers when wearing the shoe.

The Allbirds Tree Runner is available in a dozen if various color options, both subdued and bold to match your personal taste.

Easy to take care of

Giving the shoe its fresh look back couldn't be easier. Once every few weeks or months, take out the laces and insoles, put the Tree Runner in a delicates bag (or a pillowcase), and throw it into the washing machine. Be sure to use cold water and a gentle cycle with mild detergent.

Allow the shoe air dry.

Complete lab-specs overview


  Allbirds Tree Runners Average
Whole shoe
Weight (g) 239 235
Drop (mm) 13.1 14
Overall Internal Length 260.7 (men's US 8) 261
Flexibility of the shoe (N) 12.2 13
Flexibility of the shoe (Freezer 20 min) (N) 20.1 24
Flexibility of the shoe (% of change) 64.8 77.5
Longitudinal flexibility (1-5 scale, 5 being the stiffest) 1 1.0
Torsional flexibility (1-5 scale, 5 being the stiffest) 1 1.0
Thickness - Tongue (mm) 1.2 2.0
Width Upper - Forefoot (mm) 99.8 99.7
Width Upper - Heel (mm) 77.9 77.1
Flexibility of the heel counter (1-5 scale, 5 being the stiffest) 1 1.5
Tongue: gusset type both sides (semi-gusseted) -
Heel: pull tab none -
Width Midsole - Forefoot (mm) 110.6 110.6
Width Midsole - Heel (mm) 82.6 83.5
Stack - Forefoot with insole (mm) 18.0 17.3
Stack - Heel with insole (mm) 31.1 31.0
Durometer Midsole Heel (Room temperature) (HA) 29.6 31.2
Durometer Midsole - Heel (Freezer 20 minutes) 40.9 42.2
Durometer Midsole - Heel (% of change) (TEST) 38.0 35.4
Outsole thickness (Heel) (mm) 0.0 0.0
Durometer Outsole Heel (Room temperature) (HC) 62.1 63.4
Insole Heel Thickness (mm) 7.2 7.0
Insole: removable yes yes

Facts / Specs

Weight: Men 8.6oz /
Arch support: Neutral
Use: City, Disney, Europe, For standing all day, Travel
Closure: Lace-up
Material: Mesh
Features: Orthotic friendly / Lightweight / Breathable / Removable insole / Cushioned

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Laci is a contemporary dancer turned shoe aficionado. She is the most knowledgeable person when it comes to athletic shoes, size conversions and details people nitpick about footwear. She keeps the RunRepeat content gears turning 24/7. And she walks 20miles/week.