According to the Dune: Prophecy actors, the Bene Gesserit footwear is a whole thing
On stage at New York Comic Con, actress Jessica Barden shared a little secret from behind the scenes of Dune: Prophecy that she worried audiences wouldn’t get to see on screen. “The footwear was Nike Airs,” Barden laughed. “My first day on set they gave me these shoes and I was like, Whoa, the Dune space dudes wear Nike Airs footwear. ”