I bought my first two porter green stemm silicone wine glasses from a cute shop in Beaufort SC USA. They are perfect on a boat… don’t clink, don’t break, in fact they sorta bounce. Short stem = not likely to knock over and easy to hold between your fingers with an appetizer plate in hand. I just went back for more, all four are different colors so guests know which vessel is theirs. It’s a different drinking experience, but once you’re familiar, rock on.