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Diesel Size Guide
Size UK Size Head
cm in
XXS
6 1/4
54
21.2
XS
6 3/4
55
21.6
S
6 7/8
56
22
M
7
57
22.4
L
7 1/8
58
22.8
XL
7 1/4
59
23.2
XXL
7 3/8
60
23.6
XXXL
7 5/8
61
24