The Thin Blue Line!!! Blue Lives Matter! Take this homage to our men and women in blue uniform, with the Thin Blue Line flag sublimated onto our premium performance crew socks. These impressive Black Crew socks come fully equipped with protection in mind. Perfect for exercise, fitness, powerlifting, deadlfting, motocross, hardcore sports, skiing, soccer, softball, and lacrosse. Black with White and Blue. Unisex Adult Size.