The Tour de France is, as usual, the Viking of new technology. Even before the race begins, the numerous new bikes spotted at the Criterium du Dauphiné make headlines, and as the Grand Boucle progresses, new helmets, custom paint jobs, and, as always, wacky sunglasses continue to appear. Dylan Groenewegen was spotted wearing the Scicon Aeroscope cycling glasses, a 350 euro aftermarket add-on that adds an "aero beak."

The glasses were a big deal, as the Dutch national champion won stage 6, but discerning fans (and cycling glasses enthusiasts) may experience deja vu.

Brand new or not, there have been some eye-catching sunglasses in past seasons.

Oakley's Cato has graced the faces of Mathieu Van Der Pol, Yasper Philipsen, and the record-breaking Mark Cavendish. Cavendish was clearly instrumental in the development of what paved the way for the nose bridge, and at the time of its release, it was the most bizarre pair of cycling glasses in the modern era. Personally, I think they are great glasses, but a bit of a windfall in terms of absolute performance. There is no clear data on aero, but they look slippery, so it is no surprise that Cav would choose these glasses, ignoring the fact that he has been sponsored by Oakley throughout his career.

Now we are talking! The straps made them incompatible with the helmet, limiting their use in the peloton, but David Miller used them in the time trial and so did Frank Schleck.

I'd like to say that we'll never see anything bananas like this again, but you can never be sure!

While not the most eye-catching of the bunch, the POC Propel was officially the first cycling glasses to be optimized for aero. Its gain is less than a watt, but in a sport where gains are getting smaller and smaller, it's really not shocking to see it being used more and more on the face of EF Education's Easy Post this year. I've used them myself, and if you can get past the aesthetics, the huge wrap gives an overwhelming panoramic effect.

The titanium version of POC's lightweight Elicit glasses is a gram lighter than the plastic-armed model and costs $400. However, adding a nosepiece to Gronewegen's Saicon shades would make the total cost much higher.

Still, they are scarce because only a small number were produced.

Sagan's longtime sponsor, 100%, preferred to provide the star rider with eccentric eyewear for his numerous podium finishes. But many do not know that the brand got its start in the motocross business.

At one time, Slovak superstars would wear motocross goggles on their heads or around their necks when they won a race. It was like a rider wearing a baseball cap over his cycling cap, and purists hated it.