The folks over at Tifosi Optics recognized the need to create a pair of shades that are not only dependable, but can also transform and adapt to whatever adventure you embark upon, so they invented the Launch S. F. H. Interchangeable Sunglasses: a three-for-the-price of one pair of sunglasses, if you will. After all, sometimes your Saturday activities can feel a whole lot like that triathalon you ran last month--you start the morning off with a 5k run around the park, followed quickly by a swimming round of golf with Dad, soon succeeded by your kid's' mildly chaotic soccer game and dinner with their teammates, and finally you bookend the day with a speedy bike ride through town. The Launch S. F. H Interchangeable Sunglasses come fully equipped with an interchangeable frame system, including the customizable, hydrophilic rubber nose and ear pieces, a full frame, half frame, and a shield. It's important to note that each set of frames comes complete with two lenses for maximum versatility. 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 UVA/UVB 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 also increases airflow, in turn preventing fogging and encouraging optimal visibility. The included lenses are as follows: AC Red, Brown, Brown Gradient, and Clear. So whether you're cycling, golfing, hiking, or simply run.