Frame color: Tortoise Black; Lens color: Brown; Frame material: Acetate. These Tom Ford FT1205 Calder sunglasses feature a square frame in acetate, making them the perfect accessory for those who love a decisive style. The color and lenses give a modern look. Recommended for round and oval faces, as they add definition and structure to the features. These square-shaped sunglasses are great for Oval/Round shaped faces.