Black elastic strap with metal attachment clips to each end . These were fitted using the small brass 'eyes' sewn onto the rear of the Irvin 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. It retains a little elasticity but has light edge fraying/wear. The metalwork also has light corrosion. Rare to find. Sock code J17550.