Bicycle helmets; Helmets for motorcyclists; Motorcycle helmets; Motorcycle goggles; Protective helmets for cyclists; Protective helmets for sports; Protective sports helmets; Crash helmets; Crash helmets for cyclists; Helmets for use in sports; Protective helmets for motor cyclists; Sports helmets; Snowboarding helmets; Ski helmets; Ski goggles; Ski glasses; Football helmets; Riding helmets; Sports equipment for boxing and martial arts, namely, protective helmets; Mouth guards for sports use; Head guards for sports; Articles of protective clothing for wear by motorcyclists for protection against accident or injury; Helmets incorporating video cameras, namely, motorcycle helmets incorporating video cameras, Helmets incorporating Global Positioning Systems, namely, Motorcycle helmets incorporating GPS transceivers, Protective sports helmets incorporating GPS transceivers; Helmets incorporating audio and video equipment, namely, Motorcycle helmets incorporating apparatus for broadcasting, recording, transmission or reproduction of sound or images, Protective sports helmets incorporating apparatus for broadcasting, recording, transmission or reproduction of sound or images; Helmets incorporating barometers, altimeters, and gyroscopes, namely, Motorcycle helmets incorporating barometers, altimeters, and gyroscopes; Helmets incorporating tracking equipment and software, namely, motorcycle helmets incorporating GPS tracking devices and software for operating and controlling GPS tracking devices, Protective sports helmets incorporating GPS tracking devices and software for operating and controlling GPS tracking devices; Motion sensors and tracking sensors for use with helmets, namely, GPS tracking devices for use with protective helmets, motion detectors for use with protective helmets, and sensors for determining position, velocity and acceleration for use with protective helmets; Cameras for use with protective helmets; imaging equipment for use with helmets, namely, Video displays mounted in protective helmets, Eye pieces for helmet mounted displays used in protective helmets, Fixed and helmet mounted transparent electronic displays for providing aircraft crew members with navigational and operational information; Helmets with wireless and Internet connectivity, namely, Motorcycle helmets incorporating wireless transmitters and receivers, Protective sports helmets incorporating wireless transmitters and receivers; computer software for use in determining position, velocity, acceleration, motion, atmospheric pressure, distance, direction, altitude, and temperature of a helmet, and for wireless communication of audio and video, in the field of sports