Smith Optics Interlock Whisper Sunglasses composite frame composite lens Polarized Lens width: One Size Stylish sunglass with patented interchangeable lens system Arms swivel open to release lenses and swivel back to lock them Grilamid TR-90 frame with hydrophilic Megol on nose and temple pads TLT carbonic lens technology provides distortion-free clarity Offers choice of 14 replacement tint colors; lifetime warranty