The 509 Seven Threes Sunglasses bring a distinct edge to a timeless look. Like all 509 sunglasses, the Seven Threes are inspired by our unique lifestyle. We go hard, get dirty, and demand sunglasses that can keep up. Featuring Polarized FUSION 5 lenses and shockingly lightweight, comfortable, and tough TR90 Swiss thermoplastic frames, 509 sunglasses are simply built better. All styles backed by a fit guarantee and lifetime warranty.