FRAME FEATURES: OO9480 Sielo Square feature a Bio-Matter square frame in matte grenache, with Unobtainium nosepads for a no slip fit and Prizm brown gradient lenses. PRIZM Lens Technology designed to enhance color and detail for any activity. DARK BROWN GRADIENT LENSES are perfect for every day and designed to help reduce glare and enhance vision especially in medium light conditions. Light transmission: 24% CASE AND CLEANING CLOTH INCLUDED: Packaged in a case with a cleaning cloth to clean and store your Oakley eyewear. VISIT THE OAKLEY BRAND SHOP: Click on the Oakley link above the product title to shop the entire Oakley sunglass and eyeglass assortment. BIO-MATTER FRAME: BiO-Matter frame material is made from bio-materials having at least 56% bio-based carbon content. This percentage indicates how much of the material mixture is obtained from castor oil sources versus petrochemical or fossil sources.