Polarized lens are usually made from a chemical film that is applied to the surface. The film will have molecules that are parallel to each other and when applied they will create a filter that absorbs any light matching their alignment.
Eco-Friendly: Engleberts Wooden Sunglasses are sustainable. Bamboos are some of the fastest-growing plants on Earth with some types having reported growth rates of up to 3 feet in 24 hours. Bamboo can be a very sustainable crop; it requires no fertilizer and self-regenerates from its own roots, so it doesn't need to be replanted.