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 Flip Flops

USA Men EU UK
7 40 6
8 41 7
9 42 8
10 43 9
11 44 10
12 46 11
13 47 12
14 48.5 13.5
15 49.5 14.5

Women's Flip Flops

USA Women EU UK
5 35 2.5
6 36 3.5
7 37.5 4.5
8 38.5 5.5
9 40 6.5
10 42 7.5
11 43 8.5
12 44 9.5