Positioning and stabilising structure and system incorporating same

A head-mounted display system, comprising:

• a head-mounted display unit;
• and
• a positioning and stabilising structure configured to hold the head-mounted display unit in an operational position in front of a user's eyes in use,
• the positioning and stabilising structure comprising:
• a rear support structure configured to contact posterior regions of a user's head;
• a pair of connection straps connected to the rear support structure and configured to adjust a distance between the rear support structure and the head-mounted display unit;
• and
• a forehead support strap connected to the rear support structure and configured to connect the rear support structure to a superior region of the head-mounted display unit,
• wherein the rear support structure has a three-dimensional shape in the form of a hoop prior to contacting the user's head, the hoop comprising an occipital portion configured and arranged engage the user's head along a portion of the occipital bone and a parietal portion configured and arranged to overlay the parietal bones of the user's head in use,
• wherein the pair of connection straps are disposed between the occipital portion and the parietal portion,
• wherein the forehead support strap is connected to the parietal portion of the rear support structure, and
• wherein each of the forehead support strap and the pair of connection straps includes a width that varies along at least a portion of its length.