Proof is a company that was started by 3 brothers who had spent their lives working in their grandfathers wood mill, this gave them the idea of turning the wood into sun glass frames. Their frames are made from about 4 different species (bamboo, lacewood, mahogany and and an ebony stain) including eco-acetate and skateboard decks. They are all finished with a special coating that protects the wood from sweat and water damage.All of the frames have spring loaded arms that make them fit a wide range of face shapes comfortably. Proof also has an Eco-collection that is made from a cotton-based cellulose, no petroleum products were used in the making of these frames. All of the frames are Rx ready, so you can take them straight to your optometrist and have your prescription put right in.