"They're the Modern Stone-Age Family" Just those words will prompt viewers of a certain age to join in singing the show's catchy theme song. This all-time classic cartoon revolved around a stone-age family, The Flintstones, Fred, Wilma, Pebbles, and Dino the Dinosaur. These pajama pants will have you saying Yabba-Dabba-DOOOOO! These The Flintstones pajama sleep pants feature the character known as Pebbles with her name next to her and the "The Flintstones" cartoon TV show title logo beneath her. The pants themselves are made of a soft 60% cotton and 40% polyester fabric blend, for casual wear and lounging about!