Replacement Lenses for OKL HOLBROOK sunglasses 009102[2+ times easier installation] Manufactured by Italian automated optical cutting equipment [Harden Shell 3+ times higher scratch resistance] We enhance the durability by our proprietary treatment to both the front and back of the lens [High Defense 8+ times enhanced corrosion resistance] We infuse our lenses with a patented blend to enhance the Anti Seawater, Anti Oil erosion properties [Hyper Precise Polarization 100% total glare elimination]