Ray-Ban RB4397 Corrigan Bio-Based Sunglasses are a new frame, crafted from bio-acetate containing 67% bio-based carbon content. The lightweight frame has classic dark brown lenses and transparent light blue stems, perfect for those looking for style and performance. The Corrigan Bio-Based series is the ideal choice for a stylish look. Frame color: Transparent Light Blue; Lens color: Dark Brown; Frame material: Moulded Acetate