How do Allbirds fit?

Sizing varies among our styles, but all our shoes are medium width and full sizes. The Wool collection starts out a little snug and then stretches naturally, while the Tree material is super accommodating, but will fit similarly over time as it retains shape.

We've found most full-size customers stick with their full size in both materials!

If you're a half size, we've found most customers size up in every silhouette beside the Tree Runners. If you wear a half size and you have a wider foot, we'd suggest sizing up to the next full size in everything!

Still not sure? We'd love to talk to you about it! Reach out to one of our fit specialists at for some personalized advice!