Let the Tifosi Optics Escalate F. H. Sunglasses introduce you to the joys of interchangeable frames for running and cycling. Each pair comes with a full frame, two interchangeable lenses, a half frame, and two more interchangeable lenses. The half frame feels 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.