Best color for speedos at the beach.

With or without!!! I love it

I remember as boys speedos were all nylon before spandex. We would cut the liner out....

White is best color for Speedo, with no lining, skimpy.

Contrast = Impact It depends on my tan. When I don't have a tan, I avoid white and other light colors and stick to dark colors. Once I get my tan, I transition to lighter colors.  Fortunately I get very dark when I tan. There aren't too many beach days in San Francisco, so I start out beach vacations pasty white.