Outer Shell:ABS Plastic
Inner Shell:HD Polystyrene
Ventilation:10 Air Intakes
Inner lining:Fully Washable
Size Universal:Adjustable 51-62
Size Adjustment System:Up-N-Down
Lamp Carrying System:External Nylon 6.6 Lamp Clips
NOTE: Type I helmets are designed to provide crown (top) impact protection. It is not intended to provide protection from lateral (side) impacts. Class C stands for Conductive and this class is not intended to provide protection from electrical conductors, and are not tested for electrical resistance.