Polarized Lenses Polarized lenses are the only truly effective way of eliminating glare. Polarization is like a chemical Venetian blind, which filters the light and lets you see "through" the glare. Light reflected from surfaces like a flat road or smooth water is generally horizontally polarized. The vertically oriented polarizers in the lenses block this horizontally polarized light. The result is a reduction in annoying and sometimes dangerous glare. The benefits of polarized sunglasses have been realized by a variety of outdoor sports enthusiasts. Boaters, skiers, golfers, bikers, drivers, and joggers, can all enjoy a clearer view with polarized lenses. Lens Technology: All Our Polycarbonate Polarized lens are lightweight & impact resistance. They are treated with scratch-resistance hard coating with additional silver flash mirror (SFM) on the front side of the lens to enhance filtration. Plus, multi-layer anti-reflection (AR) lens treatment on the backside of the lens to enhance contrast. It also absorbs bounce back glare to reduce eyestrain & fatigue. These lenses are ideal for outdoor & sporting activities as well as general all-purpose wear. All Ground & Polish Optical Glass Polarized lens are the best available optics on the market that is scratch-resistant and durable. They are optically correct & distortion free. Great for all-purpose sunglass wear. Frame Technology: Aluminum-Magnesium (Al-Magnesium) are stainless alloy for optimal weight to resistance ratio, which is 50% lighter than titanium and best durability & lightness ratios of all alloy material. It weighs roughly about 28 grams or approximately 1 oz. It is also non-allergenic. Monel is a nickel-copper extraction characterized by an excellent elasticity & a high level of resistance to corrosion & extreme temperatures. All al-magnesium & Monel frames have spring hinges for a comfortable fit.