MODEL: DP901
EXTERIOR SHELL: Injected ABS
LINING: One piece, single density expandable polystyrene (EPS) liner
COMFORT LINING: Removable / washable paded lining
RETENTION SYSTEM: Padded strap with D-ring closure and strap keeper
VENTILATION SYSTEM: Chin vent and Force Flow® forehead vents
SIZES: Extra Small, Small, Medium, Large, Extra Large
WEIGHT: 1,420gs±30gs
PAINT: UV Painting
SAFETY STANDARD: Meets or exceeds ECE 22.05 regulations

What Size am I? 
Get a tape measure or a piece of string and measure around your head. Make sure the tape measure is resting just above your eyebrows and ears.