Helmet sizing chart in photos.

• CPSC 1203, ASTM F1952-15, CE EN 1078:2012/A1:2012
• Aerodynamic lightweight poly-alloy shell
• Padded chin strap with a D-ring closure
• Aluminum visor screws
• CSPC certified EPS foam liner for protection
• 930 grams +/-50g (size M), 2.05 pounds +/- .11lb (size M)
• Removable and washable liner and cheek pads
• True Functional Ventilation (TFV)-When in motion air is forced through multiple air intake vents, then passed through aligned vent channels in the EPS and exits out multiple rear exhaust vents