Smarty Girl Leggings for Kids 1-10Y | Explore Science in Style – Smarty Girl & Co., Smarty Girl leggings empower girls to explore STEM - science, technology, engineering, math. Because girls are more than hearts + flowers! Made ethically on pima cotton. Free U.S. shipping. Smarty Girl's mission is to empower young girls to pursue what makes them unique through clever clothing that encourages curiosity.