Base Curve: 8 Polyamide: Polyamide is hypoallergenic and can be moulded to create very thin, lightweight frames.It's scratch and chemical resistant. Polycarbonate: Polycarbonate is lightweight, comfortable, impact resistant, and provides UV protection. ChromaPop is SMITH’s proprietary lens technology that allows the eyes to identify true color. The technology filters two specific wavelengths of light that cause color confusion to give you greater definition, more natural color, and unmatched clarity.