Precise spherical lens optics plus our quick-change lens tech and the terrain-defining view of a high-contrast PERCEIVE lens.The Anon M2 Goggles feature MAGNA-TECH® quick lens-change technology, using powerful magnets to make lens changes easier than ever.Their spherical lens mimics the curvature of the human eye for precise optics, while the PERCEIVE lens enhances contrast for the best possible definition and terrain recognition.Magnetic Face Mask Integration (MFI®) enables seamless face mask coverage, and full-perimeter vents ensure maximum airflow for a clear, fog-free view in all conditions.They are over-the-glasses compatible, and include a bonus lens for cloudy conditions, an MFI face mask, and a microfiber bag for storage and lens cleaning.Features:Unisex frame design