TSG Sentinel Fullface Helmetstyle: fullface helmet material: ABS Hardshell Construction size: choose available size in the menu above XS (53 54 cm) S (54 56 cm) M (56 58 cm) L (58 60 cm) XL (60 62 cm) additional information: CERTIFICATION: NF EN 1078+A1: 02 2013, ASTM F1952 15, ASTM F1446 20, UKCA SUPERIOR VENTILATION (12 VENTS) TO ENSURE AIRFLOW IS MAXIMIZED AT BOTH LOW AND HIGH SPEEDS FRONT VENT MESH INSERT QUICK RELEASE COMFORT LINER FOR EASY WASHING AND CLEANING QUICK