Al-Mg frame : Aluminum Magnesium Frame (Lightweight, Strong and High Elasticity). The Sunglasses only about 28g. You can hardly feel them on your face, but they are unbreakable and high strength anti breakage resin lens for safe glasses.
TAC HD Clarity Lens: These sunglasses lenses are coated with imported Lt adopts,These lens are are tough, lightweight, scratch resistant, and have high optical clarity (distortion free, clear vision), perfect choice for outdoor sports and activities such as driving, fishing, skiing, travelling, hiking, boating, and is suitable as high fashion accessory and daily wear all year round.