Shock Doctor jock & bioflex cup
A very good product, but the sizing seems a bit small. My waist/hip size makes me borderline between M and L size jock, but the L size is plenty snug. The standard adult cup (black) is a bit too small; I am of slight build. I suggest the XL cup (dark blue) to pair with the jock. My local store sold only the combo jock/black cup but also sold the XL cup. I went back to get the larger cup and then discarded the black one.
The jock worn without the cup also provides the very snug support that I prefer. The narrow band makes it ideal for under swimwear, too. This is the perfect jock with or without the cup.