First step, take a soft fabric measuring tape and wrap it around the widest part of your head (over your hair) to take a measurement - it should follow a line about 3/4 inch above your eyebrows (just above the ear line and around the bump at the back of your head). Take the measurement a couple of times to achieve an accurate reading.
Head size (cm)
Helmet size
Skull cap size
49
6
000
50
61/8
0001/2
51
61/4
00
52
63/8
001/2
53
61/2
0
54
65/8
01/2
55
63/4
1
56
67/8
11/2
57
7
2
58
71/8
21/2
59
71/4
3
60
73/8
31/2
61
71/2
4
62
75/8
41/2
63
73/4
5
64
77/8
51/2
65
8
6
Charles Owen Pro II Lycra Vent Silk - Navy/Silver
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