This retro-style Go Back Grandpa! t-shirt features a distressed navy-blue illustration on a white shirt, showing an early tetrapod-like animal moving through a watery marsh scene. The design nods to the Devonian Period, when lobe-finned fishes and early land vertebrates began the evolutionary transition from water to land, paired with bold humorous lettering for a playful natural history look. Made from 100% ring-spun cotton (high-quality cotton) with a soft, sensory-friendly feel. Every order funds kelp restoration on the Pacific Northwest coast.