Most listings use polycarbonate (PC) for frames and lenses; some list metal frames. Lens materials also include optically pure acrylic (AC) in several options.
Common fit features include rubber nose pads, flexible temples, flex hinges, and extra or adjustable nose-pad areas to provide a snug, anti-slip fit.
Most entries are listed for adults: many show "Suggested Age: Adult," one specifies "18 Years and Up," and some include an "Adult Use Only" warning.
Many listings specify UV400 protection or state the lenses block 100% of UVA and UVB rays; at least one product description explicitly claims 100% protection against harmful UV rays.
