An old fashioned simple cradle-fitted helmet. One size fits most, but the Rockstar remains a pretty low-profile piece of kit. It has four side vents and rudimentary headlamp clips (better suited to fixed lamps, or headtorches might need their own clips added).
As with the Ultralight and Vertex, this helmet is less affected by water pressure than foam-lined helmets, which may be a consideration for cave divers.
Polypropylene injected shell. Weight is 390g. Colour is red.