Men’s sheer briefs Men's sheer underwear made from nylon/spandex Machine wash Made in USA California Muscle underwear style U503 Put all eyes on you in these hi-tech men's briefs from California Muscle. Made from nylon and spandex, this men's sheer underwear from California Muscle is softer than silk and employs the Maintainer Ring – a double-noose fabric ring that extends from the back of the underwear to ensure that you will be the envy of all when you show off your goods.