If you're looking for sunglasses with bio lenses, you'll love the selection we have here on ARNETTE. All of our models made from bio acetate feature these eco-friendly lenses, where the bio-based elements of the lenses come from renewable sources such as castor oil, and the emission of climate-damaging gases is reduced during the whole manufacturing process. What's even greater is that ARNETTE bio lenses maintain the same features as traditional lenses, pretty neat, right?