Patent ID: 7987525

Claim:
A helmet comprising: an outer shell comprising a fiber reinforced composite material; an impact-absorbing liner within the outer shell, the liner comprising Expanded Polystyrene having a thickness of at least about 20 mm; wherein at least one edge of the impact-absorbing liner is coated with a protective border comprising polyurethane, the protective border extending to a distance of at least about 20 mm from the nearest edge of the impact-absorbing liner, at a depth of at least about 0.05 mm; and a ventilation system comprising, an air intake subsystem comprising a plurality of air intake vents located in the outer shell and a plurality of air intake holes located in the liner; an air diffusion subsystem comprising a plurality of channels extending throughout the liner and a plenum located between an upper portion of the liner and a lower portion of the liner, the upper portion of the liner comprising a plurality of air intake holes configured to direct airflow captured by one or more of the air intake vents into the plenum; and an air exhaust subsystem comprising at least one exhaust port located in the outer shell and a corresponding exhaust hole located in the liner.