http://www.arctica.eu/p274/s-172/702/s-172b.html

*ZINGY*
EXCEPTIONALLY LIGHT WITH POLARIZED LENSES
Frame: grilamid TR90.
Lenses: TAC polarized. smoke or brightening (S-172C)
Foam layer along the top part of frame – additional protection against strong sunlight and moisture.
Adjustable rubber nosepads.
UV 400 protection.
Lens categories and light transmission:
smoke lenses: cat.3 - strong sunlight - 8%-18%
brightening lenses: cat.2 - average sunlight – 18%-43%