Photochromic lenses, impact resistant eye protection. Giants Stratos NXT Varia sunglasses are a good choice if you want photochomic eye protection for your road, trail, commuter or leisure cycling. The NXT Varia lenses are made from Trivex next generation polymer, & frames from high flexing, strong Grilamid TR90 polyamide. In built sweat flow channel, adjustable ergonomic nose pieces & anti-slip rubber temple mount. Choose from either Gloss White or Gloss Grey.