FRAME FEATURES: OX8139 HSTN RX feature a round, matte blue steel frame with Unobtainium nosepads and earsocks. PRESCRIPTION READY EYEGLASS FRAMES: Oakley eyeglass frames feature lenses that need to be replaced with prescription lenses so you can enjoy clear vision. STORAGE CASE INCLUDED: Packaged in hard case to store and protect 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. O MATTER STRESS-RESISTANT FRAME: Oakley's lightweight, durable frame ensures all-day comfort and protection. Injection-molded thermoplastic O-Matter offers better strength and flexibility than acetate, resisting shifting or deforming over time.