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. Lens Technology: All 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 eye strain & fatigue. These lenses are ideal for outdoor & sporting activities as well as general all-purpose wear. Style: Sporty Type: Watersport Sunglasses Gender: Unisex Age: Adult Frame Color: Gunmetal Lens Color: Smoke Sun Protection: 100% UVA & UVB Frame Material: Metallic