Speedo briefs help...?

all I can tell you is I wear regular, 100% nylon Speedos: the least material & non-absorbant = least weight.......... the smooth nylon offers least resistance.........tight enuff to be sleek but not impede circulation..........in Speedos I point mine sideways so there's room when I get hard.............and yeah, I've worn mine 24/7 sometimes - they dry so fast I can pull my jeans on right over them pretty quick after I come out of the water.