Warm and retro-inspired, the Lucy Brown Tortoise brings vintage charm with a modern oversized oval shape. - Recycled Polycarbonate frame. - Durable stainless steel hardware. - BPA free nylon lenses - known to have high clarity for vision, lightweight, durable & impact resistant. - Blue light protection coating lenses. - Scratch resistant coating lenses. - Hydrophobic coating lenses - Seawater corrosion protection coating lenses