It's a Faraday cage for your, um, crown jewels.
Silver fibers woven into Spartan's boxer briefs are designed to block radiation from electronics. That's good news for men who might be worried about their laptops spending too much time on their laps. But while recent research has pointed to a possible link between radiation from wireless devices and decreased sperm count, studies are far from conclusive, so there's no reason to panic just yet.
Until January, the underwear is available only on Spartan's website for about $45.