Tree Dashers & Tree Flyers come in half sizes to ensure the perfect fit for your run. They fit true to size for most customers. If you have wide feet or prefer a roomier fit to accommodate toe splay, we suggest going up a half size. For extra wide feet, go up a whole size.
Did you know that Allbirds shoes are actually unisex? You can easily cross over to find shoes in your size.
Here’s how it works:
If you wear a men’s size 7-7.5, try a women’s size 8-8.5.
If you wear a women’s size 11.5-12, try a men’s size 10.5-11.
Men’s
US
UK
EU
CM
8
7
41
26
8.5
7.5
41.5
26.5
9
8
42
27
9.5
8.5
42.5
27.5
10
9
43
28
10.5
9.5
43.5
28.5
11
10
44
29
11.5
10.5
44.5
29.5
12
11
45
30
12.5
11.5
45.5
30.5
13
12
46
31
13.5
12.5
46.5
31.5
14
13
47
32
Women’s
US
UK
EU
CM
5
2 - 2.5
35
22
5.5
2.5
35.5
22.5
6
3 - 3.5
36
23
6.5
3.5
36.5
23.5
7
4 - 4.5
37
24
7.5
4.5
37.5
24.5
8
5 - 5.5
38
25
8.5
5.5
38.5
25.5
9
6 - 6.5
39
26
9.5
6.5
39.5
26.5
10
7 - 7.5
40
27
10.5
7.5
40.5
27.5
11
8 - 8.5
41
28
Women’s sizes
US
EU
UK
5
35
2.5
5.5
35
3
6
36
3.5
6.5
36
4
7
37
4.5
7.5
38
5
8
38
5.5
8.5
39
6
9
39
6.5
9.5
40
7
10
40
7.5
10.5
41
8
11
42
8.5
11.5
43
9
Use our chart to help determine your size and width.
Men’s shoe size
US
EU
UK
CM
6
39
5
23.5
6.5
39.5
5.5
24
7
40
6
24.5
7.5
40.5
6.5
25
8
41
7
25.5
8.5
41.5
7.5
26
9
42
8
26.5
9.5
42.5
8.5
27
10
43
9
27.5
10.5
43.5
9.5
28
11
44
10
28.5
11.5
44.5
10.5
29
12
45
11
29.5
12.5
45.5
11.5
30
13
46
12
30.5
14
47
13
31
15
48
14
31.5
16
49
15
32
Men’s shoe width
Letter code
Description
A
Extra Narrow
B / N
Narrow
C
Medium -
D / M
Medium
E
Medium +
EE / W
Wide
EEE
Extra Wide
Women’s shoe size
US
EU
UK
CM
4
34
1.5
21
4.5
34.5
2
21.5
5
35
2.5
22
5.5
35.5
3
22.5
6
36
3.5
23
6.5
37
4
23.5
7
37.5
4.5
24
7.5
38
5
24.5
8
38.5
5.5
25
8.5
39
6
25.5
9
39.5
6.5
26
9.5
40
7
26.5
10
40.5
7.5
27
10.5
41
8
27.5
11
42
8.5
28
11.5
42.5
9
28.5
12
43
9.5
29
Women’s shoe width
Letter code
Description
AAAA
Extra Narrow
AA
Narrow
B
Medium
C
Wide
Men’s
UK
US
EU
6
7
40
7
8
41
8
9
42
9
10
43
10
11
44
11
12
45
12
13
46
EU
UK
US
CM
35
2.5
5
22.8
36
3.5
6
23.5
37
4
6.5
24.1
38
5
7.5
24.9
39
6
8.5
25.3
40
6.5
9
26
41
7
9.5
26.7
42
7.5
10
27.3
Women’s
UK
EU
US
3
36
6
4
37
7
5
38
8
6
39
9
6.5
40
10
7.5
41
11
8
42
12
Men’s
US
UK
EU
CM
3.5
2.5
36.5
21.5
4
3
37
22
4.5
3.5
37.5
22.5
5
4
38
23
5.5
4.5
38.5
23.5
6
5
39
24
6.5
5.5
39.5
24.5
7
6
40
25
7.5
6.5
40.5
25.5
8
7
41
26
8.5
7.5
41.5
26.5
9
8
42
27
9.5
8.5
42.5
27.5
10
9
43
28
10.5
9.5
43.5
28.5
11
10
44
29
11.5
10.5
44.5
29.5
12
11
45
30
12.5
11.5
45.5
30.5
13
12
46
31
13.5
12.5
46.5
31.5
14
13
47
32
14.5
13.5
47.5
32.5
15
14
48
33
Women’s
US
UK
EU
CM
5
2.5
36.5
21.5
5.5
3
37
22
6
3.5
37.5
22.5
6.5
4
38
23
7
4.5
38.5
23.5
7.5
5
39
24
8
5.5
39.5
24.5
8.5
6
40
25
9
6.5
40.5
25.5
9.5
7
41
26
10
7.5
41.5
26.5
10.5
8
42
27
11
8.5
42.5
27.5
11.5
9
43
28
12
9.5
43.5
28.5
12.5
10
44
29
13
10.5
44.5
29.5
13.5
11
45
30
14
11.5
45.5
30.5
14.5
12
46
31
15
12.5
46.5
31.5
15.5
13
47
32
16
13.5
47.5
32.5
16.5
14
48
33
Big Kids
US
UK
EU
CM
IN
3.5Y
2.5
35
22
8.75
4Y
3
36
22.5
8.8125
4.5Y
3.5
36.5
22.9
8.9375
5Y
4
37
23.2
9.125
5.5Y
4.5
38
23.5
9.25
6Y
5
38.5
24
9.375
6.5Y
5.5
39
24.5
9.5625
7Y
6
40
25
9.6875
Toddlers
US
UK
EU
CM
IN
7C
6
23.5
14
5.5
8C
7
25
14.5
5.75
9C
8
26
15.5
6.125
10C
9
27
16.5
6.5625
10.5C
9.5
27.5
17
6.75
11C
10
28
17.5
6.9375
11.5C
10.5
29
18
7.125
12C
11
30
18.5
7.25
12.5C
11.5
30.5
18.75
7.375
13C
12
31
19
7.5625
13.5C
12.5
31.5
19.5
7.75
1Y
13
32
20
7.9375
1.5Y
13.5
32.5
20.5
8.125
2Y
1
33
21
8.25
2.5Y
1.5
33.5
21.75
8.375
3Y
2
34
22
8.5625
Men’s / Unisex
Men’s US
Women’s US
Length (cm)
Length (in)
UK
EU
2.5
4
20.5
8.125
2
34
3
4.5
21
8.25
2.5
35
3.5
5
21.5
8.5
3
35.5
4
5.5
22
8.625
3.5
36
4.5
6
22.5
8.875
4
37
5
6.5
23
9
4.5
37.5
5.5
7
23.5
9.25
5
38
6
7.5
24
9.5
5.5
38.5
6.5
8
24.5
9.625
6
39.5
7
8.5
25
9.875
6.5
40
7.5
9
25.5
10
7
40.5
8
9.5
26
10.25
7.5
41.5
8.5
10
26.5
10.375
8
42
9
10.5
27
10.625
8.5
42.5
9.5
11
27.5
10.875
9
43
10
11.5
28
11
9.5
44
10.5
12
28.5
11.25
10
44.5
11
12.5
29
11.375
10.5
45
11.5
13
29.5
11.625
11
45.5
12
13.5
30
11.75
11.5
46.5
12.5
14
30.5
12
12
47
13
14.5
31
12.25
12.5
47.5
13.5
15
31.5
12.375
13
48.5
14
15.5
32
12.625
13.5
49
15
16.5
33
13
14.5
50
16
17.5
34
13.375
15.5
51
17
18.5
35
13.75
16.5
52
18
19.5
36
14.125
17.5
53
19
—
37
14.625
18.5
54
20
—
38
15
19.5
55
Women’s
Women’s US
Men’s US
Length (cm)
Length (in)
UK
EU
3
1.5
20
7 7/8
1
33
3.5
2
20.5
8 1/8
1.5
33.5
4
2.5
21
8 1/4
2
34
4.5
3
21.5
8 1/2
2.5
34.5
5
3.5
22
8 5/8
3
35
5.5
4
22.5
8 7/8
3.5
36
6
4.5
23
9
4
36.5
6.5
5
23.5
9 1/4
4.5
37
7
5.5
24
9 1/2
5
37.5
7.5
6
24.5
9 5/8
5.5
38
8
6.5
25
9 7/8
6
39
8.5
7
25.5
10
6.5
40
9
7.5
26
10 1/4
7
40.5
9.5
8
26.5
10 3/8
7.5
41
10
8.5
27
10 5/8
8
41.5
10.5
9
27.5
10 7/8
8.5
42.5
11
9.5
28
11
9
43
11.5
10
28.5
11 1/4
9.5
43.5
12
10.5
29
11 3/8
10
44
12.5
11
29.5
11 5/8
10.5
45
13
11.5
30
11 3/4
11
45.5
13.5
12
30.5
12
11.5
46
14
12.5
31
12 1/4
12
46.5
15
13.5
32
12 5/8
13
48
16
14.5
32.5
12 3/4
14
49
Babies and Toddlers (0-4 Years)
Kids US
Length (cm)
Length (in)
UK
EU
0
8
3.125
0
15
1
8.5
3.125
0.5
16
1.5
9
3.5
1
16.5
2
9.5
3.75
1.5
17
2.5
10
3.875
2
18
3
10
3.875
2.5
18.5
3.5
10.5
4.125
3
19
4
11
4.375
3.5
20
4.5
11.5
4.5
4
20.5
5
12
4.75
4.5
21
5.5
12
4.75
5
21.5
6
12.5
4.875
5.5
22.5
6.5
13
5.125
6
23
7
13.5
5.375
6.5
23.5
7.5
14
5.5
7
24
8
14.5
5.75
7.5
25
8.5
15
5.875
8
25.5
9
15
5.875
8.5
26
9.5
15.5
6.125
9
26.5
10
16
6.25
9.5
27.5
Little Kid (4-8 Years)
Kids US
Length (cm)
Length (in)
UK
EU
Men’s US
Women’s US
10.5
16.5
6.5
10
28
—
—
11
17
6.75
10.5
28.5
—
—
11.5
17.5
6.875
11
29
—
—
12
17.5
6.875
11.5
30
—
—
12.5
18
7.125
12
30.5
—
—
13
18.5
7.25
12.5
31
—
—
13.5
19
7.5
13
32
—
—
1
19
7.5
13.5
32.5
—
—
1.5
19.5
7.625
1
33
1.5
3
2
20
7.625
1.5
33.5
2
3.5
2.5
20.5
8.125
2
34.5
2.5
4
3
21
8.25
2.5
35
3
4.5
Big Kid (8-12 Years)
Kids US
Length (cm)
Length (in)
UK
EU
Men’s US
Women’s US
3.5
21.5
8.5
3
35.5
3.5
5
4
22
8.625
3.5
36
4
5.5
4.5
22.5
8.875
4
37
4.5
6
5
23
9
4.5
37.5
5
6.5
5.5
23.5
9.25
5
38
5.5
7
6
24
9.5
5.5
38.5
6
7.5
6.5
24.5
9.625
6
39
6.5
8
7
25
9.875
6.5
40
7
8.5
Tips For Finding Your Perfect Size
Try shoes on in the late afternoon when your feet are at their largest due to normal swelling.
Check that your heel fits snug with no slipping. The midfoot of the shoe under your arch and over the top of your foot should be snug but not tight. You should have enough room in the toe box to wiggle your toes.
Choose the larger size if your feet are between sizes. You can adjust for a better fit with socks, insoles and lacing patterns.
Have your feet re-measured every year. Feet typically get bigger with age and women’s feet often become a half size or more larger after pregnancy.
Be sure to try shoes on both feet. Your left and right feet may differ in length or width as much as a full size. Always buy shoes that fit your larger foot.
Watch out for signs that your shoes are too small or narrow: feet cramping and falling asleep while running or the formation of calluses and blisters in between or on your toes. People are more than twice as likely to buy a shoe that is too small than too big.
Women’s Size Chart
EU
AU / UK
US (approx.)
37
6
6.5 - 7
38
7
7.5 - 8
39
8
8.5 - 9
40
9
9.5 - 10
41
10
10.5
42
11
11 - 11.5
Men’s Size Chart
EU / BR
US men’s (approx.)
36
7
37 - 38
7.5 - 8
39 - 40
8.5 - 9
41 - 42
9.5 - 10
43 - 44
10.5 - 11
45 - 46
11.5 - 12
47
12.5 - 13
Fit and Design Details
Widths: Many Opananken styles feature regular, medium, and wide options alongside adjustable hook-and-loop velcro straps.
Diabetic-friendly build: The brand constructs many of its antistress models with soft sheepskin or mestizo leather and minimal internal seams to reduce friction.
Shoe Size Comparison Table (UK - EU)
As you browse our website you will notice that some shoe sizes are displayed in UK sizes and some are displayed in continental sizes, due to different countries of manufacture.
To ensure you are able to select the correct size please use this handy table chart to convert from UK to continental size and vice versa.
Continental to UK
EU
UK
35
2.5
36
3
37
4
38
5
39
6
40
6.5
41
7
42
8
43
9
44
9.5
45
10.5
46
11
47
12
UK to Continental
UK
EU
2
35
2.5
35
3
36
3.5
36
4
37
4.5
37
5
38
5.5
39
6
39
6.5
40
7
41
7.5
41
8
42
8.5
42
9
43
9.5
44
10
45
11
46
12
47
Size chart - Shoes
Size
Foot length (cm)
35
21.8
36
22.5
37
23.1
38
23.8
39
24.5
40
25.1
41
25.8
42
26.5
43
27.1
44
27.8
45
28.5
Size chart - Boots
Shaft width
Calf width (cm)
XS
0 - 29.9
S
30 - 34.9
M
35 - 39.8
L
39.9 - 42
XL
42.1 - 45
Women’s Size Conversion & Foot Length
EU
US
UK
Foot length (cm)
36
6
3.5
22.6
37
6.5
4
23.3
37.5
7
4.5
23.6
38
7.5
5
23.9
38.5
8
5.5
24.2
39
8.5
6
24.5
40
9
6.5
25.1
Men’s Size Reference
Valleverde men’s casual and comfort footwear (such as breathable walking shoes and sandals) generally follows standard EU sizing steps from 40 through 45:
EU
US (approx.)
UK (approx.)
40
7
6.5
41
8
7.5
42
9
8.5
43
10
9.5
44
11
10.5
45
12
11.5
General EU to US Sizing Reference for Comfort Slippers
EU
US women’s (approx.)
US men’s (approx.)
37
6.5 - 7
—
38
7.5 - 8
—
39
8.5 - 9
6.5 - 7
40
9.5
7.5
41
10
8
42
—
8.5 - 9
43
—
9.5 - 10
44
—
10.5 - 11
45
—
11.5 - 12
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