The medium-fit, square polycarbonate frame is designed with the serious anglers in mind. Lightweight, with full coverage for optimal polarized viewing, non-slip nose and temple pads, they have great functionality both on and off the water. Polarized Lenses Eliminate Glare and Reduce Eye Fatigue. Polarized Triacetate Lenses are Impact and Scratch Resistant, Lightweight and Durable. AcuTint™ Lens Coloring System Adds Color Contrast Without Distorting Natural Colors, Allowing You To See More Clearly. 100% Protection From Harmful UVA and UVB Rays.