You can now see more than ever before. The 4D MAG raises the bar for lens innovation with the introduction of BirdsEye Vision. This state-of-the-art lens technology has a 25 percent increase in overall field of view compared to the I/O MAG. In addition, Smith has evolved Smith MAG by integrating the dual locking mechanisms into the goggle frame outriggers to make a quick and easy lens change system. With BirdsEye Vision featuring ChromaPop lens technology, you'll be able to see even more detail as you take on untracked territory.