Size 

Men's footwear

O'Neill product size (EU)

UK size

USA size

Footwear length (cm)

39

6

7

2.60

40

7

8

2.67

41

7/8

8/9

2.74

42

8

9

2.80

43

9

10

2.87

44

10

11

2.94

45

11

12

3.00

46

12

13

3.07

47

13

14

3.14