Adjustable headgear and cover

Adjustable headwear

Adjustable headwear

Adjustable helmet

Adjustable helmet and related method of use

Adjustable helmet having an improved locking mechanism

Adjustable helmet shell

Adjustable helmet with disabling insert

Adjustable hockey helmet

Adjustable protective helmet

Adjusting device for hat with sweat band

Adjustment mechanism for a helmet

Adjustment mechanism for a helmet

Aerodynamic bicyclist's helmet construction

Air distribution plenum with silencer for head enclosures

Air filter device

Air intake device in helmet

Air jet

Airbag module for protection of the cervicodorsal region

An article of headgear