Allbirds Mizzles Review: Are Waterproof Allbirds Worth it?

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As a big fan of the Allbirds Wool Runners, I was excited to try the water repellent version, the Allbirds Wool Runner Mizzles.

These cosy merino wool sneakers sounded even better for winter wear with non-slip soles and the ability to withstand rain.

Like all Allbirds shoes, they are super comfortable, machine washable, and made from sustainable materials.

I’ve put these Allbirds waterproof shoes to the test for the last four months during autumn and winter in New Zealand. I’ve worn them on hikes and bike rides, to restaurants and wineries, in the city and countryside.

In this Allbirds Mizzles review, I share their pros and cons, test whether they really are waterproof, and compare the original Allbirds Wool Runners with the Mizzles.

While I have the women’s version of the Allbirds Mizzle, they also come in a men’s version that’s the same.


Note: Allbirds sent me the Mizzles for review but this is my honest opinion. Simon and I have both paid for multiple pairs of Allbirds shoes as we love them so much.

Styles of Allbirds Mizzles

Allbirds makes several styles of Mizzles. They are all made from merino wool with a water repellent shield and are available in men’s and women’s versions.

Casual Shoes

These are the most similar to the classic Allbirds Wool Runners. Despite the name, they are designed for casual use rather than running.

  • Wool Runner Mizzles – These are the original Mizzles and have a sneaker style like the Wool Runners. These are what I have and will be writing about in this Allbirds Mizzles review.
  • Wool Runner-Up Mizzles – This high-top version comes higher up on your ankles.
Allbirds Wool Runners Mizzles in Ironbark colour amongst autumn leaves
My Allbirds Wool Runners Mizzles in the Ironbark colour

Running Shoes

If you want to run in cold, wet weather, the Dasher Mizzles are the shoes for you. Some people also like them for walking as they have more supportive soles with increased traction compared to the Wool Runner Mizzles.

They feature a tongue-less design and come in half sizes, but they aren’t as warm as the Runner Mizzles and are more expensive.

See my Allbirds Tree Dashers review for details on the warmer weather version, which I wear for running.

Allbirds wool dasher mizzles page from website

You can also see my Allbirds review, which focuses on the original Wool Runners, for a full breakdown of all Allbirds shoes.

My Allbirds flats review compares the Tree Breezers to other popular ballet flats.

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Allbirds Wool Runner Mizzles Details

Sizes: Women’s US 5 – 11 and men’s US 8 – 14 (no half sizes).
Colours: 9 colours in the US (fewer options in other countries).
Weight: 280g (9.9oz) per shoe (women’s US 8).
Price: US $115 with free shipping and 30-day returns (price varies by country).
Buy from: Allbirds website in many countries including US, UK, Canada, Europe, Australia, and New Zealand.

Allbirds Wool Runner Mizzles page on website

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Allbirds Mizzle Sizing

Allbirds Wool Runner Mizzles come in whole sizes only. I found them true to size and went with a US8, which is also my size for the classic Wool Runners and Tree Dashers.

Allbirds recommends that you size up if you are a half size, especially if you have wider feet (all Allbirds shoes are medium width).

If you aren’t sure about sizing, Allbirds has a generous returns policy, which makes them easy to return—see below.

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Allbirds Wool Runner Mizzles Pros

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Free Shipping

I love that Allbirds are available in many countries worldwide with free shipping on orders over $50.

You can buy the shoes online in the US, Canada, UK, EU, Australia, New Zealand, China, Japan, and Korea.

In the US, standard shipping takes 5 – 10 business days to arrive from when the order is placed. Expedited shipping is also available.

My Mizzles took one week to arrive in New Zealand.

All Allbirds shoes arrive in simple packaging that’s easy to open. They use just one box made from 90% recycled cardboard that works as the shoebox, shopping bag, and mailer all in one.

Allbirds Wool Runner Mizzles in Ironbark

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30-Day Free Trial

One of the things I love most about Allbirds is their incredible returns policy. Even if you’ve worn the shoes outside, you can return them within 30 days if they don’t work out for you. No questions asked.

This makes it really easy to try out new styles of Allbirds like the Mizzles.

Sending shoes back is simple—just attach the included return label to the box they were sent in. Return shipping is free.

Allbirds donates the lightly used returned shoes to charity.

Hiking in my Allbirds Wool Runner Mizzles
Hiking in New Zealand in my Allbirds Wool Runner Mizzles

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The reason that the Mizzles are the fourth pair of Allbirds shoes I’ve bought is that they always feel so good on my feet straight out of the box.

Even without socks they feel cosy and my feet don’t ache when wearing them.

That said, there was some adjustment compared with my original Wool Runners (the non water resistant kind), which I talk more about below.

I’m not the only one who finds the Wool Runner Mizzles super comfortable. Here are some reviews from the Allbirds website:

“I love these shoes! I have several foot problems… including bunions. I usually only buy shoes if they are available in wide widths but decided to take a chance with Allbirds. These shoes were comfortable from the minute I put them on!”

“Feels like I’m walking on clouds every time I wear them. Super comfortable, supportive, and stylish. They go with so many outfits I wear. Can’t recommend enough.”

“I love these shoes. I am a nurse and I wear them for at least 12.5 hours. They are so comfortable!”

Visiting Mt Difficulty Winery in Bannockburn wearing my Allbirds Wool Runner Mizzles
Visiting Mt Difficulty Winery in Bannockburn wearing my Allbirds Wool Runner Mizzles

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Great for Short Hikes

The Allbirds Mizzles are more structured than the Wool Runners with higher ankle support and more traction on the soles.

I often wore my Wool Runners for short walks, but the extra traction has made me more confident wearing my Mizzles on longer hikes that include hills and uneven trails.

Traction on the soles of the waterproof Allbirds Wool Runner Mizzle
Traction on the soles of the Allbirds Mizzle

So far the longest hike I’ve done in them was 13km/8 miles in Abel Tasman National Park on a chilly morning. Even after three hours of walking my feet felt totally fine.

I’ve now worn them on multiple hikes and bike rides and even played tennis in the rain.

The reviews agree:

“I walk my dog every morning in these shoes. We go 4 to 5 miles on rocky, hilly trails. These shoes are the best. Cozy and warm without being too warm.”

“Amazing! I am a nurse assistant and I average 5.5 miles a day walking—sometimes running—on the job. These shoes have saved my feet. The support is amazing and they absorb shock. They make you feel light on your feet, bouncing off each step.”

That said, the Allbird Mizzles aren’t hiking shoes so I wouldn’t recommend them for very long or challenging hikes.

Hiking in Abel Tasman National Park in my Allbirds Wool Runner Mizzles
Hiking in Abel Tasman National Park on a cold winter morning in my Allbird Mizzles

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Water Resistant

What stands the Mizzles apart from other Allbirds styles is that the merino wool upper is treated with a bio-based water repellent shield.

Allbirds does not claim that they are fully waterproof, but they stand up to light rain much better than the original Wool Runners. They are definitely a good option for drizzly climates.

Wearing my Allbirds Wool Runner Mizzles in the rain
Wearing my Wool Runner Mizzles in the rain

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Made from merino wool, the Wool Runner Mizzles keep your feet warm in cold weather.

Merino wool is much softer than regular wool with no itchiness. It’s also breathable, moisture-wicking, and odour-resistant.

While the Mizzles were ideal for my winter hikes, I did find my feet getting quite hot on warmer days (over 15ºC/60ºF) on extended walks. I was wearing merino socks, though.

The Allbirds Tree Runners are a better option for summer wear—Simon wears his year-round.

Inside the Allbirds Wool Runner Mizzles

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Odour Resistant

After four months of regular wear, my Mizzles have very little odour. I do mostly wear them with socks, though, which may help.

When I had some odour issues with my Wool Runners, I found it was easily solved by washing the insoles (which are also replaceable).

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Machine Washable

I haven’t needed to wash my Mizzles yet, but I’ve washed my Wool Runners multiple times with no problems.

Allbirds Wool Runner Mizzles are machine washable. You should use a gentle, cold cycle and air dry them.

Allbirds recommends using a delicates bag, but I don’t have one. I also don’t remove the laces and insoles to hand wash as they recommend. Instead, I leave the laces tied up and remove the insoles but throw them in the wash with the shoes.

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Allbirds are committed to sustainability and all their shoes are carbon neutral. They use natural, renewable materials and offset carbon emissions.

The Mizzles are made of the following materials:

  • Upper made from ethically-sourced ZQ merino wool.
  • SweetFoam midsole made from renewable sugar cane. This prevents the need for EVA, a polluting, petroleum-based plastic foam used in most shoe soles.
  • Insole made from castor bean, which emits less carbon than petroleum-based foam, and merino wool.
  • Laces made from recycled plastic bottles.
Wearing my Allbirds Wool Runner Mizzles in Gibbston Valley
Wearing my Mizzles in Gibbston Valley

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After four months my Wool Runner Mizzles still look great with only a few smudges on the light grey soles. I’ll report back after I’ve worn them for longer.

I’ve found all my Allbirds very durable. I only felt the need to replace my original Wool Runners after two years. They had no holes or serious issues, but they looked a bit grubby (especially the soles) and the tread on the soles had faded in parts.

I think the Mizzles will be even more durable due to the much deeper treads and more robust upper.

Check out the Allbirds Wool Runners Mizzles here.

Allbirds Mizzle vs Wool Runners
My new Allbirds Mizzles (left) vs 2-year-old Wool Runners (right)

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Allbirds Wool Runner Mizzles Cons

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Not Fully Waterproof

The Mizzles keep my feet dry in light rain, but if I wear them for prolonged periods in heavy rain, or once for 15 minutes in a torrential downpour, the water seeps through the shoes, mostly around the toes.

They are certainly more water resistant than the original Wool Runners, but if you want fully waterproof shoes, look for Gore-tex hiking shoes (which I don’t find as comfortable).

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Slower to Break-In

The Mizzles are the only Allbirds shoes I’ve had a breaking-in period with—my original Wool Runners, Tree Dashers, and Tree Breezer flats were instantly comfortable.

Assuming the same from my Mizzles, I set out on an hour-long hike without socks soon after I first bought them. They ended up rubbing the back of my heel and were uncomfortable to wear for a while, even with socks.

This is because the Mizzles are stiffer than other styles and don’t mould to your feet as much.

After a month or so, they felt much more comfortable, and I’ve now worn them on long hikes without problems. I can also wear them without socks now, although I haven’t tried this for extended walks.

Reviews are mixed with some customers saying they had zero break-in period and others taking a little longer:

“They took a bit to break in (including moleskin for the heels), but these are now my most comfortable, solidly supportive shoes. Very stylish too.”

“These shoes were so comfortable right from the first wear, no breaking in necessary.”

Cycling the Gibbston Valley Trail in my Allbirds Wool Runner Mizzles
Cycling the Gibbston Valley Trail in my Allbirds Wool Runner Mizzles

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Not Super Lightweight

The Allbirds Wool Runner Mizzle is my heaviest Allbirds shoe at 280g/ 9.9oz per shoe vs 199g/7oz for my Wool Runners.

The extra weight is due to the more structured, supportive upper and the thicker sole with more traction.

I don’t think the Mizzles are heavy shoes and I never feel that they weigh my feet down. It’s more a consideration if you are comparing them to other Allbirds styles.

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Limited Colours

Compared to other Allbirds shoes, there aren’t quite as many colours available for the Mizzles, especially outside the US store.

The classic colours are natural grey, dapple grey (much lighter), and true black (with a black sole).

I went for one of the limited edition colours, Ironbark, a pale greenish/grey colour with a light grey sole. I really like it.

Note that colours look quite different in the various Allbirds fabrics. Simon has the Ironbark Tree Runners and it’s a much darker colour.

Other limited edition Mizzle colours currently available are Savannah Night (dark blue), Black Sands (dark grey), Pacific (vibrant blue), and Aurora (dark green).

See the full range of Mizzle colours here.

Allbirds Mizzles in Pacific colour on Allbirds website
Wearing my Allbirds Wool Runner Mizzles

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Allbirds Wool Runners vs Mizzles

Allbirds Wool Runners vs Mizzles
Wearing Allbirds Mizzles (left) and Wool Runners (right). Note my Mizzles are new and my Wool Runners nearly 2 years old.

How do the Allbirds Wool Runner Mizzles measure up against the original Wool Runners?

They are both excellent cold weather shoes made from cosy merino wool with many of the same features—they are machine washable, odour resistant, and made from renewable materials.

Here are the main differences:

Allbirds Wool Runner Mizzles:

  • Water repellent
  • Bulkier
  • Heavier (280g vs 199g per shoe)
  • Stiffer
  • More structured
  • More ankle support
  • Thicker soles with more traction and deeper treads
  • Better for hiking
  • Longer break-in period
  • Not as warm and cosy to wear barefoot
  • Can’t slip on without untying laces
  • $20 more expensive

Allbirds Wool Runners:

  • Not rain-resistant
  • Smaller and easier to pack
  • Lighter
  • Floppier and more flexible
  • Lower on the ankle with less support
  • Not as much traction on soles
  • No break-in period
  • Warmer
  • Ultra cosy and soft inside
  • More comfortable to wear barefoot
  • Easy to slip on and off without untying laces
Allbirds wool runners vz mizzles
Allbirds wool runners vs Mizzles

I was initially hesitant about the Mizzles. They didn’t feel as cosy, light, or comfortable as my slipper-like Wool Runners, and they rubbed the back of my foot when I wore them without socks.

Once I’d worn them in, though, I appreciated the extra ankle support, traction, and rain-repellence, especially for hiking.

Traction on sole of Allbirds Wool Runner Mizzles vs Tree Runners
Increased traction on the sole of the Allbirds Wool Runner Mizzle (left) vs Simon’s new Allbirds Tree Runner (right), which has the same sole as the original Wool Runners.

If you want a more supportive, structured shoe, or will be wearing them in the rain or hiking trails, the Mizzles are the better choice.

For everyday wear, I prefer the original Wool Runners. They feel as light as air on my feet, almost like I’m not wearing shoes at all.

They are cosier to wear barefoot and I can slip them on without untying the laces. The lighter, floppier upper also makes them easier to pack for travel.

Both are fantastic shoes and you can’t go wrong with either—remember you have a 30-day free trial!

See my Allbirds Wool Runners review for more details about the classic version.

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Summary: Are Allbirds Mizzles Worth It?

Wearing Allbirds Mizzles on Bannockburn Sluicings Trail in New Zealand

Yes, Allbirds Wool Runner Mizzles are worth it. They are good value for high-quality sneakers made from sustainable materials.

The Mizzles are warm, comfortable shoes that keep your feet dry in light rain. They are stylish enough for city exploring but have enough support and traction for short hikes.

With a 30-day free trial, there’s no reason not to give them a try and see if they work for you.

Check out Allbirds Wool Runner Mizzles on the Allbirds website.

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