With Magnet-Assisted Technology that lets you swap out lenses and attach your facemask quickly the Anon Sync Goggle is a versatile option for any skier or snowboarder looking for high quality technology at a reasonable price. Crystal clear visibility is provided by the Integral Clarity Technology with SONAR by ZEISS technology providing contrast and definition. The Anon Sync features triple layer face foam to offer a secure seal around the face and increased levels of comfort and these snow goggles are also compatible with Anon MFI® facemasks for seamless weather coverage Completing the design is a snapback closure that lets you dial in your fit and easily secure your goggles over your beanie or helmet.Anon Sync Goggle Features:   Anon Cylindrical Lens Technology M-Fusion Magnetic Assisted Lens Change Technology Triple Layer Face Foam Wall-to-Wall Vision Lightweight Thermoplastic Polyurethane (TPU) Frame ICT (Integral Clarity Technology) Full Perimeter Channel Venting Main Lens SONAR Smoke Bonus Lens SONAR Infrared Microfiber Goggle Bag Helmet Compatible Over The Glass (OTG) Compatible Medium / Large Fit