There is a trend of sunglasses made of wood now. I think this is for the fact of environment conservation. Acetate is plastic and can be harmful (although Stella McCartney has been releasing sustainable ones but they're just almost 50% sustainable) so I guess wood is the best way. But they are waterproof so don't worry. :)
So Woodzee collaborated with Winery Robert Mondavi Private Selection. They had their oak barrels become the material for the sunglasses. Each frame is distinctively tinted due to contact with the wine (of course they won't be consistent.)
This is taken from Dailymail.com:
One California winemaker has collaborated with a local sunglass company on a line of eyewear made from recycled wine barrels.
$120 shades, which have been produced in limited-edition quantities,
are even wine-tinted - courtesy of the barrels’ former life as a wine