Ethereal is Thought Space Athletics’ swirled premium plastic, moulded by MVP: semi-translucent, grippy, known for its colour patterns. Eight moulds are listed, and Nebula Ethereal is a further swirl run.
It’s the grippy premium class: good hand in weather, holds flight for a long time. Aura is the opaque sibling.
It’s less clear than Ethos and beats in a little faster.