When most people think of wearable technology, the first thing that comes to mind are devices like the Apple Watch and Google Glass (RIP). Wireless Armor makes a different kind of wearable tech that, if it does what it says it does, could be far more valuable then telling you when your next meeting is.

Wireless Armor’s line of underwear claims to protect your family jewels from 99.9% of electromagnetic radiation that is emitted from Wi-Fi enabled devices like your smartphone or laptop. A recent study conducted in Argentina concluded that keeping a wirelessly-connected laptop close to your testes for prolonged periods of time could decrease male fertility. So imagine what keeping your phone in your front pocket all day is doing to your sperm. To combat the problem, Wireless Armor’s garments are made with a pure silver mesh that is woven into the fabric. The silver creates a protective layer that blocks the radiation from reaching your junk.

The “underwear for superheroes,” as Sir Richard Branson has called them, come in either a boxer brief or a shorter trunk style with the silver mesh woven into either the front or all around the underwear. Prices start at $37, which seems like a small price to pay for healthy swimmers.

Justin Tejada is a writer and editor based in New York City. Follow him on Twitter at @just_tejada.