FRAME FEATURES: OX8178 Rafter feature a rectangular, matte blue steel Bio-matter frame. PRESCRIPTION READY EYEGLASS FRAMES: Oakley eyeglass frames feature lenses that need to be replaced with prescription lenses so you can enjoy clear vision. MICROBAG AND CLEANING CLOTH INCLUDED: Microbag storage and cleaning cloth included to clean and store your Oakley eyeglass frames. 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 with 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.