When Smith created the I/O, they invented a category.
As the original interchangeable goggle, the I/O is the standard by which all other goggles are measured.
As early as 1965, Smith pioneered the snow goggle as we know it today. Created to give fanatic shredders more time on the mountain without foggy vision, Smith have dedicated the past 50 years to improving the way we see things. If you aren't gazing at the sun through a Smith lens, are you even gazing at the sun?