Ray-Ban - Ray-Ban Liteforce Tech RB4179 sunglasses are a perfect combination of iconic design and innovation. A new bio-material made of a semi-crystalline thermoplastic used in aerospace, automotive, and for medical implant technology gives you superior lightness, durability, and comfort in a plastic frame. These rectangular sunglasses for men feature a curvacious top bar in a super light injected construction, allowing the same thickness of a metal frame. The polycarbonate lenses are available in P3 polarized with a hydro-oleophobic coating which resists liquids on the lens.Category 3. General purpose sunglasses. High protection against sunglare, good UV protection, not suitable for driving at twilight, at night or under dull light.