INTERCHANGEABLE PERFORMANCE SUNGLASSES: Tifosi?s interchange models come with three pairs of easy to change lenses per frame. There are two sets of lenses to choose from, each tailored toward a specific use. The Bike/Run Interchange is optimized for endurance activities and includes a smoke tint (sometimes available with a Clarion Mirror), an all-conditions red tint, and a clear set lenses. ASIAN FIT/LOW-BRIDGE FIT: Tifosi Optics introduces Asian Fit, sports optics that combine high performance technology, great looks and now a larger range of fit options. The Asian Fit models have been designed to accommodate Asian Fit specifications. Lens shapes, frame angles, and nosepiece have been modified for better fit, function and comfort. More specifically: Abbreviated lens curvature keeps frame clear of cheeks. Narrowed nose pad fits frame higher on face. Decreased lens angle at lower edge for better overall fit, clearing cheekbones. Tifosi?s Asian Fit models feature adjustable temples for a custom fit. In addition the nose pads and temple pads are made of hydrophilic rubber that grips through sweat. Ventilated lenses increase airflow and reduce fogging. The frames are molded from Grilamid TR-90, a flexible and virtually indestructible material characterized by and extremely high alternative bending strength, low density and high resistance to chemical and UV damage. All Tifosi eyewear offers 100% protection against harmful UVA/UVB rays.