"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 pants will have you saying Yabba-Dabba-DOOOOO! These pajama pants feature The Flintstones along with their TV show cartoon logo running down the pant leg. The pants themselves are made of a soft 60% cotton and 40% polyester fabric blend, for casual wear and lounging about!