Don't even try to measure your insole, you'll never get it right. Just look at the measurements on any of your sneakers in CM or CHN. Then take that information and find the corresponding US size in the size guide. For example, the insole length of 25 CM corresponds to US 7 in Vans. You may get a different US size with a different brand due to slightly different measuring.
New Era 9Forty, 9Twenty, Twenty9, Forty9 caps - unisex
Circumference
55,8-61,5
New Era 39Thirty caps - unisex
Size
Circumference
XS-S
54,9
S-M
56,3-58,7
M-L
58,7-63,5
L-XL
61,5-63,5
New Era tops - unisex
Size
Chest (cm)
XS
87-92
S
92-97
M
97-102
L
102-107
XL
107-115
XXL
115-123
XXXL
123-131
XXXXL
131-139
New Era 59Fifty, 19Twenty caps - unisex
Size
Circumference
Age
6
48,2
0-2
6 3/8
51,1
2-4
6 1/2
52
4-6
6 5/8
53
6-12
6 3/4
53,9
6-12
6 7/8
54,9
7
55,8
7 1/8
56,8
7 1/4
57,7
7 3/8
58,7
7 1/2
59,6
7 5/8
60,6
7 3/4
61,5
7 7/8
62,5
8
63,5
New Era Bucket caps - unisex
Size
Circumference
XS
54,9-56,8
S
57,7
M
58,7
L
59,6
XL
60,6
XXL
61,5-63,5
S/M
54,9-56,8
M/L
58,7
L/XL
60,6
New Era bottoms - unisex
Size
Waist (cm)
Hips (cm)
XS
66-70
94-98
S
70-74
98-102
M
75-78
102-106
L
78-82
106-110
XL
82-86
110-114
XXL
86-90
114-118
New Era
New Era Cap Company Inc. was established in 1920. From that time it has become the leading headwear producer and creator of New Era Apparel. Its products are able to move beyond time, culture, sport and fashion. New Era is the exclusive producer and marketer of caps worn by every Major League Baseball player.