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Giro Helmet Size Chart

Giro Helmet Size Chart

Superfit Helmet SizeSize (cm)Size (in)
S51-5520-21.75
M55-5921.75-23.25
L59-6323.25-24.75
 
Universalfit Helmet SizeSize (cm)Size (in)
Toddler46-5018.25-19.75
Youth55-5919.75-21.75
Adult54-6121.25-24
XL58-6522.75-25.75
  

Helmet sizing is determined by the distance around your head in centimeters.  Measure the circumference of your head just above your eyebrows to determine your correct helmet size.