Compatible with Variable Lens System (VLS) goggles only. This lens system allows for the transfer of standard and injection molded lenses in the same frame. Airspace and Main goggles share the same standard and injection molded lens as well as tearoffs. Our Spark lens is mirrored for improved visibility and reduce glare in bright daylight. Variable Lens System™ (VLS) replacement lens Standard Lexan™ lens Lexan™ lens offers excellent UV protection Offers 100% UVA and UVB protection