Upstart junior: 2 vents, airevac ventilation maximizes goggle and helmet airflow to reduce fogging and control temperatures certification, bombshell construction with full ear coverage, helmet size chart, removable goggle lock upstart junior sizing: helmet fit systems hfs youth small 48cm-53cm, med-large: 53-58cm. Upstart weight: 17oz 490 grams upstart certification: astm f-2040, en 1077
Upstart junior: 2 vents, airevac ventilation maximizes goggle and helmet airflow to reduce fogging and control temperatures certification, bombshell construction with full ear coverage, helmet
