In our experience, most hard hats come in light colors (yellow, white, light blue), not dark colors. As a result, our most popular hard hat stickers use color schemes that contrast with these lighter hats. In most cases, the stickers have a dark colored outer ring. For firefighter helmet labels, however, the color schemes are usually reversed, because the most common firefighter helmet colors are red and black. For darker helmets like these, lighter colored stickers are more common.