Vintage MANDATE! support hi-rise that slims men's underwear.   #481 Medium (34-36) white.
In original box, some wear to the box.  

Seems expensive for their time.  MSRP was $11.00.  The (A&S) Abraham & Strauss sales tag was $8.80.
Miracle spandex (60% nylon 40% spandex). The waistband elastic is still working great even after at least 50 years.