Under Silk, 100% silk made in China, are my green silk boxers with three tiny buttons on the fly. Love them and their tiny buttons that take so long to button/unbutton! I've had them so long that I can't recall where I got them, but I agree that cradling my genitals keeps a semi a good part of the day, so they're worn on special occasions.
Another option is boxers made of nylon tricot. Players is a brand that is available online from freshpair.com, internationaljock.com..... I thought they might be sticky but they aren't. They have just a bit of stretch so they don't need to be so big. I can wear them all day long and never need to adjust. They are relatively inexpensive at around 8 USD per pair.
I have many pairs of silk boxers and am wearing some right now, in fact. Sometimes though I do prefer a material that is more absorbent, supportive, and/or breathes better.