SIZING INFORMATION: This frame size is Medium with a hinge to hinge measurement of 129. Ideal for average faces. FRAME FEATURES: OO9533 HSTN SQ feature a square, abyss frame and Prizm sapphire lenses Oakley Plutonite lenses provide impact resistance and 100% UV protection (UVA, UVB, UVC, and blue light up to 400nm). PRIZM SAPPHIRE EVERYDAY are for use in medium to bright light, offering a vibrant yet natural environment. Light transmission: 12% 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 UNOBTANIUM EARSOCKS & NOSE PADS: Unobtanium earsocks and nose pads for increased comfort and performance. Pads increase grip with perspiration to help provide a secure and custom fit