Junior shouldn't bail on school just yet, but he can still get plenty of extracurricular trail time in Dakine's Dropout Short Sleeve Kids' Jersey. Cut from quick-drying and breathable polyester, it'll keep him cool on after-school bike park laps and weekend trail rides alike, and the Polygiene anti-odor treatment will make sure he doesn't end up smelling like his old gym clothes. Material: Polyester.