Big boys 12 to 24 hours post pump.
I would have preferred Hillcrest best had it been a smaller size and a different material. It's pocket is the only one I've tried truly designed for pumpers. All other underwear for well endowed men have the seam at the perineum / base of balls way too high, the balls get bunched up, they don't hang. Perhaps they offer more space with bigger waist size but my waist size is small.