Pringles aren't actually potato chips, instead they're dehydrated potato flakes pressed into their signature parabolic shape. When other potato chip manufacturers complained, the FDA ruled that Pringles couldn't be marketed as chips.
This Is Why Pringles Aren't Really Potato Chips | Reader's Digest
History of Pringles: Name, Origin Story, Timeline, Fun Facts & More - Thrillist
How Pringles potato chips are made revealed in video | Daily Mail Online
Pringles now being made with rice rather than potatoes - for a very good reason - Mirror Online