Hand made in high quality acetate for a premium feel with robust seven-bar hinges & metal logotype. The polarized lens filters light that has been reflected which is great close to or on the water where youd rather see whats under the surface than the surface itself. It also decreases the glare for more comfort. The grey lens has a VLT of 15% &40; Cat 3&41; & a neutral tint that is relaxing for your eyes during long term use. The lenses are made in NXT a lens material that provides superior optical performance & protection. Treated with anti-scratch anti-reflective oleophobic & hydrophobic coatings.