Oakley Enigma Mass OX8191 819102. See and be seen in Enigma Mass, a bold style designed to grab attention through structural artistry and dramatic edge. With a nod to Oakley®’s heritage, the shape of each temple was inspired by the signature sunglass trigger stem design. This full-rim frame is made from lightweight O Matter™ and lightweight C-5® temples that taper from thick to thin. TruBridge Sport Unobtainium® nosepads keep the frame firmly in place while Unobtainium® earsocks provide a no-slip grip. Order Enigma Mass with Oakley Authentic Prescription Lenses for consistent high quality in fit, form and function from lens to frame. Oakley OX8191 Enigma Mass Gray. Medium Gray Full-Rim for Men. These Square shaped eyeglasses are great for Oval/Round shaped faces.