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.