This bold natural history tee highlights the horseshoe crab, a living fossil whose lineage dates back to the Ordovician period, over 450 million years ago. Featuring a vibrant retro illustration with dramatic lightning, ocean waves, and warm sunset tones against a black background, the design has a vintage, distressed scientific-poster feel that celebrates evolutionary resilience. 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.