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Liquid Force Helmet Size Chart

 Size              HeadSize (inches/cm) 
YS 19 - 20 / 48.3 - 50.8
 XS/YL  20 - 20.75 / 50.8 - 52.7  
 S  20.75 - 21.25 / 52.7 - 53.9
 M  21.25 - 22 / 53.9 - 55.9
 L  22 - 23 / 55.9 - 58.4
XL 23 - 24 / 58.4 - 70
To determine your helmet size simply measure the circumference of your head above your ears and around your forhead.