Both will do. You can wear a blue hat or a black hat when running. The best-looking running hats are advanced gray, khaki and the most classic white and black. Choosing a sports hat depends not only on what color is popular, but also on whether it suits you. For example, people with rosy skin have a wide range of choices, and common colors can basically be matched; People with gray skin can choose light blue, brown, lavender and other colors; People with white skin try to avoid choosing white, and other colors can be tried; People with dark skin choose the color of their hats according to their clothes; People with yellowish skin try not to choose yellow-green color.