Here is the size guide for Xero Shoes sandals.

While we know that choosing the right size is a personal matter, we recommend leaving a space between 0.8 and a MAXIMUM of 1.5 cm.

Remember that measurements may vary depending on the measuring instrument and technique used.

ATTENTION:Xero has "men's" and "women's" sizing. They are not equivalent.

Men
EU Size	Inner Length	Inner Width
39.5	25.8	9.4
40	26.1	9.5
40.5	26.5	9.6
41	26.8	9.6
41.5	27.5	9.8
42	27.9	10
43	28.4	10.2
43.5	29	10.3
44	29.5	10.4
44.5	30	10.5
45	30.6	10.6
45.5	31.1	10.8
46	31.5	11
47	32	11.2
48	32.6	11.4

 

Women
EU Size	Inner Length	Inner Width
35.5	21.9	8.7
36.5	23.3	8.9
37	24.1	9
38	24.5	9.1
38.5	25	9.3
39	25.5	9.4
39.5	26	9.5
40	26.5	9.7
40.5	26.9	9.8
41	27.4	9.8
41.5	27.6	9.9
42	28.1	10
42.5	28.6	10.1