The spacesuit helmet is attached to the suit with a flexible collar, which allows the astronaut to move their head (a problem with real life spacesuits).
The early scenes in Breakaway have a different collar, made of cloth with a zip at the back.
Later in Breakaway we see the corrugated rubber collar. The bolts on either side of the neck ring are spring-loaded and hold the helmet in place.
The spacesuits have patches of Velcro to secure the neck ring. In the first series these are black, except for Helena's in white. Later, additional Velcro patches were added in a complete ring around the neck, this time in the same orange as the suits so they are not clearly visible on screen.
Real-life spacesuits also use Velcro to attach outer layers.
There are also a number of metal snap fasteners at the back; here there are 3, but other suits have 1 or 2.
In The Infernal Machine, the Velcro patches have been removed (their original location, and the stitching holes, are visible). Under the spacesuits, the Alphans wear black sweaters.
Normally the helmet is taken off from the neck ring, but occasionally we see the helmet and neck ring held together.
In many episodes, there is a black fabric inside the collar.
In The Immunity Syndrome, Helena and Maya's neck rings are painted white ("We can replace the metal seals on our spacesuits", although they are actually fibreglass). Fraser's is still silver.
Copyright Martin Willey