There's a time and a place to sweat the details. Designing the Riptide, we did just that. These Smith sunglasses are a classic, Italian-made style with bio-based frames. Spring hinges expand the fit at the temples. The extra flex is not only more comfortable, but feels snug through runs and bike rides. These glasses come in two lens options, each with glare-cutting polarization. ChromaPop+ lenses boost detail, color and clarity while ChromaPop™ Glass has the added benefit of high scratch resistance. Vision ChromaPop™ Glass polarized lenses cut glare and enhance color and contrast, and are highly scratch-resistant Smudge and moisture resistant coating for easy cleaning and clear optics Anti-reflective coating improves clarity and reduces eye strain Fit / Integration Medium-large fit, medium coverage 6-base lens curvature provides a modest wraparound fit Megol nose and temple pads provide non-slip grip so glasses stay put Spring hinges self-adjust to your face for a snug, comfortable fit Frame Evolve bio-based frame material is lightweight and durable