ZONBAILONMens Bulge Enhancing Underwear Briefs with Ball Pouch Sexy Low Rise Soft Bamboo

After a full day of wear, do the stretch out and slide off your bottom?

Isn't the fabric material 84% nylon and 16% spandex, at least for the white colored ones?

Does this product have a pouch to put your balls into to keep then from touching your leg?

I am wondering if I wear these in the gym locker room....will bros think they're 'panties'.....being 'silky'....do they come off as 'sissy'?