Manufacturer: FMA Material: TPE Lens color: gray Lens thickness: single-layer lens with a thickness of 3mm; Double layer lenses with a thickness of 6mm Frame color: Black/BK; Sand color/DE; TAN color (three color selection) The product comes with two types of buckles: direct wearing or helmet wearing, easy replacement Explanation: The difference between two types of lenses is that double-layer anti fog and anti scratch, single-layer anti fog PC (polycarbonate) lenses, commonly known as bulletproof glass, can withstand high-strength The impact has a cross blocking effect on high-temperature splashes, protecting the eyes from harm. Double layer anti scratch lens: Anti scratch lens is a type of lens with a special coating added, and the outer mirror surface is treated hard. This type of lens is more resistant to scratches than uncoated lenses (6mm thickness) Single layer anti scratch lens: Anti scratch lens is a lens with a special coating added, which is more scratch resistant than uncoated lenses (3mm thickness)