Features Curvature 6 Base Curvature Frame Material Grilamid Lens Tech 100% UV Protection Polycarbonate ArcFrame Measures 54-20-137 Includes Custom Leather Case Details 5-Barrel HingesCurvature
6 Base Curvature - The base curvature corresponds to the curve of the lens. The higher the number, the higher the curve. 6 base styles have a “flatter” look. 8-9 base curves hug closer to the face. Frame Material
Grilamid - These frames are crafted from bomb-proof Grilamid, enjoy! Lens Tech
100% UV Protection - The sun is harmful to our bodies and eyes, all Spy lenses are 100% UVA/UVB/UVC protected so you can worry about your goggle tan while Spy shields your eyes.
Polycarbonate - Polycarbonate lenses provide optically correct vision and are highly shatter-resistant.
Arc - Accurate Radius Curvature lenses are injected in a unique tapered shape to provide optically correct, distortion free viewing at all angles, ensuring against discomfort and eyestrain. Frame Measures
These measurements include the width of the lens, the width of the bridge and the length of the arms measured in millimeters.
For example, a 59-15-135 frame:
1) Lens Width - 59mm
2) Bridge Width - 15mm
3) Arm Length - 135mm 54-20-137