Sammy's modish rounded butterfly shape is crafted from eco-friendly handmade bio-acetate. The innovative bio acetate material is plant-based, organic, and fully biodegradable. This frame is fitted with Terra lenses, the high performance, off-duty lens. Brighten up all the colors of nature with this polarized brown-based, flash mirrored lens, perfect for all outdoor sports and in lower light conditions at dawn or dusk.