Built for the days when you can't decide what adventure you feel like embarking upon the most, the Tifosi Optics Launch F. H. Interchangeable Sunglasses cater to the shifting sunlight and varied terrain with ease. These are not only dependable, but incredibly versatile with their unique frame construction and polarized lenses, and in turn offer paramount protection and ample versatility in otherwise murky situations. So whether you're tearing up the singletrack or trekking through muddy trails, the Launch F. H. caters to your every adventure. The Launch F. H. Interchangeable Sunglasses come fully equipped with an interchangeable frame system, including a hydrophilic rubber nose and ear pieces, a full frame and a half frame. It's important to note that full frame is compatible with the smoke and clear lenses while the half frame is compatible with the AC red and smoke lenses. The frames are easily customized because of their unique notch system and universal arms: all you have to do in order to customize your frames is pivot the arm up and onto the notch until the arm clicks into place. Additionally, the frames are constructed with a durable, homopolyamide nylon called Grilamid TR 90 that's known for its low density, high resistance to chemical and UV damage, and incredible bending strength while the Tifosi polycarbonate lenses protect you against harmful UVAUVB rays with its true polarization that's embedded into the material itself rather than simply coated with a thin layer of polarization treatment. Not to mention, these decentered lenses are also furnished with ventilation and a glare guard, which prevents unnecessary glare and increases airflow, in turn preventing fogging and encouraging optimal visibility. 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.