From the brand's website: "Shreddies award winning flatulence filtering underwear for men combines classic styling & supportive technology making Shreddies the ultimate pair of gentlemens flatulence filtering underwear"
While it's clearly a fan of the run-on sentence, the company's "flatulence-fitlering" tech claims to prevent runs of another variety. (See also: an incontinence line.) It uses a "thin and flexible carbon cloth" that filters odors up to 200 times better than other garments, thus sparing people the humiliation that comes with feeling gassy.
Smells like smart innovation to us.