M4, the high-end model representing Anon (a subsidiary of Burton). It features MAG (magnetic) lens replacement, allowing for quick changes even with gloves on. This is a highly reliable model for days with unpredictable weather or for those who ski from morning to evening. This is an Asia Fit model, designed to fit Japanese facial shapes well and minimize gaps around the nose. It offers particular peace of mind for those who prioritize a good fit. The lens is spherical. It offers a very wide field of vision both vertically and horizontally, making it easy to choose your line when carving at high speeds or in powder. Used about 10 times. There are scratches on the lens, but I haven't noticed any significant impact on my field of vision during actual skiing. It's still a functional goggle that can be used without issues for practical purposes. In terms of other brands, it's in the same class as Oakley Flight Deck (M4/M3), Smith I/O MAG, and DICE BANK. Among these, the M4 offers a good balance of lens size and fit, and its MFI compatibility ensures comfortable integration with face masks. Its compatibility with Burton helmets is, of course, excellent. It is widely suitable for freeriding, carving, powder, and backcountry. Recommended for those who prioritize "field of vision, fit, and ease of lens change." ⸻ Please check before purchasing to avoid issues. There are scratches, but it is in usable condition. Please check the photos. Please refrain from purchasing if you are sensitive about condition. No returns or exchanges (3N). ⸻ Keywords #SONAR #mag #smith #i/o #squad #MFI #WM1 #WM2 #WM3 #M2 #M3 #M4 #M4s #bank #dice #bank #ridgeline