Sunglasses with interchangeable lenses are often better in concept than practice. Lenses get smudged, dropped, and lost—and wrestling with the frame to switch them can feel like trying to tie your shoes while wearing mittens. As for the frames, well, who knows what priorities the designers are given, but Ugly and Uncomfortable usually battle it out at the top. So, now comes Oakley with a new swappable model called the Jawbone and you gotta wonder, what, you think you can do better?

Oakley’s answer is always, “Yes.” In this case, they’re right: The Jawbone is a great new sunglass.

But here’s important thing—the fact that you can switch the Jawbone’s lenses easily is irrelevant. And that’s how it should be: Make a terrific glass, build it to work when running, riding, paddling, skitching, ferret-legging, or whatever, and then worry about how to switch lenses.

The Jawbone’s twin-lens design provides every bit the coverage of the Razor or M Frame, but with better blockage of reflected light between the bottom of the lens and your cheekbone. Indeed, there’s actually more coverage above the eye, so when you’re on the bike and have your hands on the drops, you can actually see down the road instead of just your front wheel. As for peripheral vision, the lenses wrap well around the sides, giving the same side-sight as with the M Frame but less distracting light bouncing around. Fogging was non-existent—and that was without the vented lenses.

It’s also the most comfortable frame I’ve worn in ages. Love the M Frames, but their arms pinch and give me a headache on long rides. The Razor’s better, but still grips a bit too tight. And the arms of both designs are so curved they don’t feel right if slipped under a helmet strap. The Jawbone’s arms, however, get the job done with a velvet grasp—enough to keep ’em on, not enough to hurt. I didn’t measure them in a lab, but they don’t seem as stiff, either, and that pliability lets them slip inside a helmet without poking.

What of the interchangeability? Clever, clever, clever. Each nosepiece flips up to unlock the bottom of the frame, which is hinged at the temple and opens wide like a jaw to expose the lens in its cradle. (This being the trademark era, it has a name: Switchlock. Oakley being Oakley, I’m surprised it’s not Warlock.)

There’s no wrestling, grunting, or cursing; it couldn’t get easier and still lock the lens in place when closed. Until you can remove the lens with a tractor beam or magnet or antigravity machine, you still have to actually touch it, but fingerprints and smudges are minimized.

Complaints? Not one. Near as I can tell after using it after six hours (one mountain bike ride, one road ride, one trail run, one road run), it’s flawless. If anything unsavory pops up in longer-term testing, I’ll add it to the review. In the meantime, though, the Jawbone is a clear winner.

The Oakley Jawbone comes with two sets of lenses, an extra nosepiece, and in eight colors. Prices start at $195. I tested the polarized version, which goes for $250. www.oakley.com.