Black elastic strap with metal attachment clips to each end . These were attached to the Irvin using the small brass 'eyes' sewn onto the rear of the collar. These straps are often referred to as spare goggle straps but were in fact used to help pull the collar into the upright position. The elastic is in good order bar minor floors (see photo). On the downside the connectors and adjuster slide are corroded. Remarkably difficult to find. Sock code J19800.