K2 Helmet Sizing Chart

Men's Helmets

Small	51 - 55cm
Medium	55 - 58cm
Large	59 - 62cm (Rival) 58 - 61cm (All other models)

Youth Helmets

XSmall	48-51cm
Small	51 - 55cm
Youth	51 - 55cm

Rant and Clutch Helmets

Small	51 - 55cm
Medium	55-58cm
Large/XLarge	58-61cm

K2 Ally Pro Audio Helmet - Women's
K2 Diversion Helmet
K2 Illusion Helmet - Youth
K2 Indy Helmet
K2 Phase Helmet
K2 Phase Pro Audio Helmet
K2 Rant Helmet
K2 Rant Pro Audio Helmet
K2 Rival BC Helmet
K2 Rival Helmet
K2 Rival Pro Audio Helmet
K2 Shadow Helmet - Youth
K2 Virtue Helmet - Women's