Sperry for Men

US UK EU
6 5 38
6.5 5.5 38.5
7 6 39.5
7.5 6.5 40
8 7 40.5
8.5 7.5 41.5
9 8 42
9.5 8.5 42.5
10 9 43
10.5 9.5 44
11 10 44.5
11.5 10.5 45
12 11 45.5
12.5 11.5 46.5
13 12 47
13.5 12.5 48
14 13 48.5

Men's Width Translation

Slim (S) B
Medium (M) D
Wide (W) EE
Extra Wide (XW) EEE