Quick answer
The Women's Tree Glider Natural Black fits true to size for most, but if you're between sizes, size up for a comfortable fit with the Blizzard sole.
Why fit matters for the Tree Glider
Getting the right fit is the difference between a shoe you reach for daily and one that sits in the closet. The Tree Glider is designed as an elevated active style, so it should feel snug but not tight, with enough room to move naturally.
Because the upper is made from a eucalyptus-derived TENCEL™ Lyocell and recycled polyester blend, it has a soft, flexible feel that adapts to your foot over time. That means a slightly roomy fit at first is fine—it won't stretch dramatically, but it will mold to your shape.
How to check fit and first impressions
- Measure your foot at home: Place your heel against a wall, mark the longest toe, and measure in inches or centimeters. Compare to Allbirds' size chart. Common mistake: measuring in the evening when feet are swollen, which can lead to sizing up unnecessarily. Measure both feet and use the larger one.
- Decide on size based on your usual fit: If you're between sizes, choose the larger size. The Tree Glider fits true to size for most, but the Blizzard sole adds a bit of height and cushioning that can feel snug if you're at the edge of a size. Common mistake: assuming you need to size down because the knit is stretchy—this can cause toe cramping. When in doubt, size up.
- Try them on with the socks you'll wear: Wear the type of socks you plan to use daily—thin no-show socks for casual wear, thicker socks for workouts. Walk around and check for heel slip and toe room. Common mistake: testing with bare feet or dress socks, which gives a misleading fit. There should be a thumb's width of space at the toe.
- Evaluate the Blizzard sole comfort: The Blizzard sole provides a cushioned, lightweight feel. Press down on the midsole and walk on different surfaces to gauge support. Common mistake: expecting a rigid, structured shoe—this is a flexible, everyday active style. If you need extra arch support, consider adding an insole.
- Check the return policy before you commit: Allbirds offers a 30-day return policy on unworn shoes. Keep the box and tags until you're sure. Common mistake: wearing them outside before testing indoors, which may limit return options. Test on clean, dry surfaces first.
Product facts
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Women's Tree Glider - Natural Black (Blizzard Sole): The Tree Glider features a Tree Knit upper made from eucalyptus-derived TENCEL™ Lyocell yarn and recycled polyester blend. This breathable, flexible knit adapts to your foot, so you can expect a comfortable, sock-like fit that moves with you.
Women's Tree Glider - Natural Black (Blizzard Sole)