Tifosi Optics' new interchangeable frames make the Escalate H. S. Sunglasses perfect for cyclists and runners. Each pair comes with a half frame with two interchangeable lenses and two frameless Shield frames with fixed lenses. The Shield frames feel best during high endurance workouts, while the full frame has a more casual look for life off the bike. A simple clip lets you interchange each frame in seconds, and the padded temples and nose pads adjust for a personalized fit. Tifosi Optics coated the scratch resistant lenses with a hydrophilic coating to repel water, oil, and dirt. Proposition 65 Warning for California Consumers: This product contains chemicals known to the State of California to cause cancer andor birth defects or other reproductive harm.