88-89% density (11-12% VLT) This relatively neutral gray-green filter is considered a marginal glacier density lens. It offers truer perception, but is less forgiving in hazier or lower light conditions offering less detail than amber-brown options. This lens is also available as the Malachite Polar which will reduce glare further, but is not recommended where ropes or jumping crevasses are employed. Polarized lenses may also black out some LCD screens. Available in plastic and NXT, single vision and progressive.