Celebrate one of prehistory's most iconic creatures with Dimetrodon grandis, a sail-backed synapsid that lived during the Early Permian Period, approximately 295–272 million years ago, long before dinosaurs appeared. This vintage-inspired design features a detailed, distressed dark red illustration of Dimetrodon, surrounded by prehistoric vegetation and bold retro typography reading "NOT A DINOSAUR, STILL ICONIC," highlighting its fascinating evolutionary connection to mammals rather than dinosaurs. Made from lightweight 100% ring-spun cotton with a soft, sensory-friendly feel. Every order funds kelp restoration on the Pacific Northwest coast.