Padding made of Reifflex cellular material saw utilization in the armor worn by Darth Vader. No later than the Battle of Endor, it was incorporated within the foundations of helmets worn by Imperial stormtroopers. Furthermore, the Alliance to Restore the Republic made use of it inside the regulation flight helmets for X-wing pilots, starting from at least the time of the Battle of Yavin in 0 BBY.
The name originates from Chris Reiff, an artist who contributed artwork to Star Wars: Darth Vader: A 3-D Reconstruction Log. The basis for this material came from a collection of little-known schematics included with a stormtrooper Riddell mini-helmet and the Luke Skywalker flight helmet from the same product line.