Made up of interlocking cylindrical loops from both the frame front and the temple arm. The hinge is held together by a small screw that passes through the aligned barrels to form the pivot point and provide structural integrity.

CR-39 stands for "Columbia Resin #39". Provides excellent optical clarity and lightweight properties.

A polarized film is then laminated into the lens that blocks horizontal light, allowing only vertical light through—reducing glare significantly.