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How to choose your preferred helmet size. 

To determine size: Measure around your head 1 inch above your eyebrows and across the largest portion of the back of your head. 
Scoot Tip: Some people use a string to wrap around their head and then measure the length of the string. Use the chart below to determine your preferred helmet size based on the measurement you get.

Sunny Day Scoot helmet size chart:

Sizes                         Inches                        Centimeters

XS                   20 1/4 – 20 7/8                53 – 54

S                               21- 21 5/8                 55 – 56

M                      21 3/4 – 22 3/8                57 – 58

L                        22 1/2 – 23 1/8                59 – 60

XL                      23 1/4 – 24                       61 – 62

XXL                   24 1/8 – 24 7/8                63 – 64