Finding the perfect pair of shoes is about more than just looks—fit and comfort are key, especially when you’re investing in eco-friendly footwear like Allbirds. Whether you’re eyeing the classic Wool Runners, the breathable Tree Dashers, or their stylish flats, understanding how Allbirds sizing works will help ensure you get the right fit from day one.
Why Allbirds Fit Differently
Allbirds shoes are crafted from natural materials like merino wool and eucalyptus tree fiber, which feel and behave differently than traditional synthetic fabrics. These materials offer flexibility, breathability, and softness but may also result in slight variations in fit across different styles.
General Allbirds Sizing Tips
- Allbirds shoes are available in whole sizes only. If you typically wear a half size, it’s generally recommended to size up.
- No break-in period. Most Allbirds styles are designed to be comfortable right out of the box.
- Materials stretch slightly. Wool and knit uppers will mold to your feet over time.
Wool Runners and Loungers: Sizing Advice
The Wool Runners and Wool Loungers are made with soft merino wool that gently conforms to your foot.
- Fit: Snug but soft—like a slipper.
- Sizing Tip: Size up if you’re a half size.
- Good for: Narrow to average-width feet. The wool adapts well to different foot shapes.
Note: Because the wool stretches, don’t size up too much—your foot will settle in naturally after a few wears.
Tree Runners, Dashers, and Skippers: Sizing Advice
These styles are made from eucalyptus-based fabric that’s more structured and breathable than wool.
- Fit: Sleek and lightweight, with a tighter weave than wool.
- Sizing Tip: Size up if you’re between sizes.
- Good for: Warmer climates, people who prefer a more performance-oriented or breathable shoe.
Tree Dashers (performance running shoes)
- Fit: More supportive and secure, especially around the heel and midfoot.
- Sizing Tip: Go half a size up if you have wider feet or are between sizes.
- Note: The Dashers are slightly more structured and have a firmer sole than casual styles.
Allbirds Tree Breezers (Flats): Sizing Advice
These ballet-flat style shoes are popular for their versatility and comfort.
- Fit: Snug across the toes and flexible in the heel.
- Sizing Tip: Size up if in-between sizes or if you have wider feet.
- Break-In: Minimal, but the knit may stretch slightly after a few wears.
- Good for: Office, travel, casual outings—an elevated look with Allbirds comfort.
Allbirds Mizzles (Water-Resistant Styles): Sizing Advice
The Mizzle collection includes water-resistant versions of Wool Runners and Dashers with added features for weather protection.
- Fit: Slightly more structured due to the water-repellent finish.
- Sizing Tip: Still size up if you’re a half size, but expect a slightly firmer feel than the originals.
- Good for: Rainy weather, cold climates, and winter walks.
Allbirds Loungers and Slippers
These slip-on styles are the ultimate in comfort, perfect for around-the-house wear.
- Fit: Soft and relaxed.
- Sizing Tip: Size up for half sizes.
- Pro Tip: These are ideal for travel or indoor comfort, but not designed for rigorous outdoor wear.
Allbirds for Wide Feet
While Allbirds doesn’t offer official “wide” sizes, many customers with wide feet find the wool styles accommodate them well thanks to the flexible knit material. Tree-based styles are slightly narrower but still stretch over time.
- Best styles for wide feet: Wool Runners, Wool Loungers, Tree Skippers.
- Avoid: Tree Dashers or Breezers if your feet are particularly wide—unless you size up.
How to Know If Your Allbirds Fit Right
Here’s what a good fit should feel like:
- Toes have a little wiggle room, but not slipping.
- Heel is secure without rubbing.
- No pinching across the widest part of the foot.
- Comfortable right out of the box (no major break-in needed).
Returns and Exchanges
One of the best parts of shopping Allbirds? Their 30-day trial policy—even if you’ve worn the shoes. If your pair doesn’t fit just right, you can exchange or return them, no questions asked.
Final Thoughts: Find Your Perfect Fit
Choosing the right size in Allbirds depends on your foot shape, style preference, and whether you wear socks. In general, size up if you’re between sizes, and pay attention to the specific style’s material. With their flexible return policy and commitment to comfort, you can feel confident trying Allbirds and finding the perfect fit for your lifestyle.
