Tough as nails and built to protect, the Stacker features a removable eye mask and our exclusive hidden directional airflow system. Direct Flow Hidden Lens Ventilation system, and removable Eye Mask for reduced exposure to wind and elements exposure. Stealth technology for the most demanding conditions you face.'AoFrame: 6 base mold injected grilamid frame in feather weight construction with performance grip nose bridge and temple tips. Innovative double action hinge system.Optics: 6 base melanin infused polycarbonate lenses. 100% UV protection. Up to 98% blue light protection.Direct flow hidden lens ventilation system, and removable eye mask for reduced exposure to wind and elements exposure.Polarized Pro lenses. 99.9% Premium glare reduction, relaxed/soothing eye feeling, true color perception, and scratch resistance with the added benefits of hydrophobic coating, oleophobic coating, anti-reflective coating, and on select styles flash-mirror coating.Visual Light Transmitted: 10%. Optimal lens for daily use. Increased clarity and depth perception while providing visual comfort.Includes microfiber cleaning bag.Designed in California. Made in Italy.Lifetime warrantyMeasurement: 55h - 143w - 140l (Large Sized Frame)Weight: 33 gramsHelpful information: California Residents, Read Prop 65 Warning