If the shoes fit snugly at first, just wear them for a day or two and they will form to your feet. If you are between sizes, order the half size larger.

Men's Shoes

USA Men EURO UK
7 39.5 6
7.5 40 6.5
8 40.5 7
8.5 41 7.5
9 41.5 8
9.5 42 8.5
10 43 9
10.5 43.5 9.5
11 44 10
11.5 45 10.5
12 45.5 11
13 47 12
14 48.5 13.5
15 49.5 14.5

Women's Shoes

USA Women EURO UK
6 36.5 3.5
6.5 37 4
7 38 4.5
7.5 38.5 5
8 39 5.5
8.5 39.5 6
9 40 6.5
9.5 40.5 7
10 41 7.5
10.5 41.5 8
11 42 8.5
11.5 43 9
12 43.5 9.5