Bolle nerox 8 sunglasses information the nerox 8 is a round frame with a bold style. Refined down to the last detail, this model with polarized lens is equipped with the bollé signature flex hinge, making it extremely comfortable and an easy fit for many faces. Both frame and lens are made from bio-based material with recycled metal parts. Slf polarized lens made from 39% bio-based nylon anti-scratch coating oleo hydrophobic coating 54% bio-based acetate frame made with renewable castor oil bollé signature flex hinge 91% recycled metal parts fit: med-lg eyesize: a:50mm b: 45mm, dbl: 22mm. Tt:137mm tl: 140mm see more help tab for full sizing information for lens color descriptions, see bolle lens color page. Bolle prescription information bolle authentic prescription lenses available. Lenses will be made with the bolle authentic b-thin design. B-thin utilizes software that can make the most advanced calculations to create a more customized lens and the ultimate in lightweight optics freeform digital technology is part of this lens . An axial compensation of the prescription takes into account the size of the frame and the wearer's facial anatomy if necessary. This ensures optimum precision, comfort and frame balance for sports glasses. Available in 99% of prescriptions. B-thin lenses are up to 72% thinner and 45% lighter than other lens technology. Available in polycarbonate and trivex lens materials. Both are impact resistant but trivex has slightly better optical clarity...