Custos.co, a specialist in wearable technology eyewear, has debuted the eponymous Custos sport eyewear—featuring the intriguingly named “bone conduction technology.”

The sunglasses—because, at the heart of things, that’s what they are—will do a slew of things, besides shield the wearer from electromagnetic radiation and UV rays. They also can take high-definition video and photos, and feature a Bluetooth-enabled phone and music support, and are designed to offer what the company calls “ultimate situational awareness,” to record and remember the user’s activities.

The glasses have a natural sweet spot for customers: outdoor enthusiasts. These can run the gamut from hardcore extreme sports addicts, runners, cyclists, hikers and backpackers to weekend warriors and friends and family looking to enjoy a festival, picnic, sporting event, kid’s game, day at the beach, walk in the park and so on. Anyone who doesn’t want to bother with lugging along a phone or camera to capture the experience—be it someone hanging off the side of a rock face or a mom who’s worried about getting sand in her iPhone (News - Alert).

“The common thread uniting these active, happy people is their desire to minimize their technology so they can participate more, have more fun and still have a beautiful, high quality, high definition record of their experience,” the company said in its media kit.

But what about the bone conduction technology? This allows the glasses to transmit audio waves to the inner ears through the skull, bypassing the eardrums completely. Eyewear naturally fits onto a human’s skull just above and behind the ears. This leaves the ear canals open, allowing the user to remain alert and aware of their surroundings even as they take calls or listen to music.

“While Custos is exactly what I had envisioned in a group of features I wanted to incorporate into this wearable tech, I am continually being surprised at all of the different and unique ways the field testers have found to use Custos,” said Kurt Inagaki, former professional fly fishing guide, entrepreneur and founder of Custos.co “Custos is the realization of  my personal and professional quest for the non-clunky, comfortable, easy-to-operate and hands-free eyewear I was looking for and hoping to find.”

The bone conduction aspect also means that Custos (which is Latin for “guardian,” by the way) is also self-contained, which is a nice perk. There are no cumbersome ear buds hanging from the glasses, no paddles attached, nothing has to be plugged into the frames.