The Anon M4 Snapback Cylindrical Goggles feature MAGNA-TECH quick lens change technology to make lens changes easier than ever. Their snapback strap eliminates pressure points for comfortable wear under a helmet. A cylindrical lens provides maximum field of vision without distortion, while PERCEIVE lens technology enhances contrast for the best possible definition and terrain recognition. Anon's exclusive magnetic face mask integration (MFI) offers a seamless connection to MFI-compatible face masks. A lightweight dual-molded frame with full-perimeter vents flexes for a snug, comfortable fit and fog-free vision in all conditions. They are over the glass compatible, include an MFI face mask, a spare lens for cloudy conditions, and a microfiber bag for storage and lens cleaning.