Helmets are supposed to be well fitted for comfort and worn low on your forehead.
Please measure one cm above your eyebrows and straight around your head.
Small up to 56cm - however if this is for a lady with lots of hair we recommend you choose a medium
Medium up to 59 cm
Large up to 61 cm
XL up to 63 cm
FOR HELMET BAG SIZING PLEASE REFER TO THE DESCRIPTION