Futuristic underwear can block the smell of farts - Men let loose 10/23/2013 - 00:00 A healthcare underwear company has designed a range of briefs and boxers which use chemical warfare technology to filter unwanted gas.The hi-tech pants, created by Shreddies Ltd. based in Leicestershire, England, feature a highly absorptive carbon cloth back panel which traps and neutralizes flatulence odors.