The Anon M4S Perceive Goggle Lens (Cylindrical) gives your Anon M4 goggles maximum adaptability — swap to the right lens for the right conditions in seconds using Magna-Tech® magnetic technology. Cylindrical lens construction delivers outstanding peripheral clarity and Perceive® optics, with Integral Clarity Technology anti-fog treatment for crystal-clear vision all day long. M4S Compatible: Designed to fit Anon M4S goggles, lens compression case included. Perceive Lens Technology: Perceive lens provides high-contrast vision and terrain defining clarity in just about any light condition; A hydrophobic and oleophobic coating provides unmatched smudge, scratch, and moisture resistance on the outer lens surface for clear optics and easy cleaning. Magna-Tech®: Magna-Tech® quick lens-change technology uses powerful rare earth N52 magnets for a seamless and secure lens-to-frame seal that makes for easy lens changes and unsurpassed lens retention. Cylindrical Lens: Cylindrical injected lens design reduces peripheral distortion. Anti-Fog: Integral Clarity Technology Anti-Fog exceeds industry anti-fog treatment standards, delivering crystal clear vision that lasts for an extended period of time. All Anon products are backed by a 1-year warranty from date of purchase.