SIZING INFORMATION: This frame size is Medium with a hinge to hinge measurement of 131. Ideal for average faces. FRAME FEATURES: OX3217 Socket 5.0 feature a rectangular, satin mahogany frame. PRESCRIPTION READY EYEGLASS FRAMES: Oakley eyeglass frames feature lenses that need to be replaced with prescription lenses so you can enjoy clear vision. LIMITLESS COLLECTION: Pushing beyond your limits can yield unexpected results.​ Featured color combinations offer a refreshing perspective​, with new accents like Muted Metallic Mahogany provide subtle shimmer​. High energy eyewear for the bold. Unobtainium EARSOCKS & NOSE PADS: Unobtainium earsocks and nose pads for increased comfort and performance. Pads increase grip with perspiration to help provide a secure and custom fit. VISIT THE OAKLEY BRAND SHOP: Click on the Oakley link above the product title to shop the entire Oakley sunglass and eyeglass assortment.