qft. I/os are much smaller.
No they aren't. They are actually very comparable in size (eg2 is only slightly bigger), but that doesn't play as big of a role as the amount of foam and frame material there is.
I give Smith I/O the advantage over the EG2 in this battle. The EG2 does not have a larger field of vision. This is due to the EG2 actually having a frame. Smith's frameless design just can't be beat. There is no plastic intruding in on your field of vision. Electric does address this in their 2010 models because they reduced the amount of frame material, but still can't beat no frames.
Smiths also have a much better lens construction. They are beasts when it comes to combating fog. Electric just can't compete Smith in this department.
The I/O is also super easy to swap lenses with. Plus they give you and extra lens, microfiber bag, and a durable nylon zipper case that houses your goggles and multiple lenses.
The last advantage that Smith has is their helmet compatibility. Smith also has great, great helmets. Their helmets are specially designed to be compatible with all of their goggles. The helmets have a ventilation system that they call "Air Evac" along the front tip. These vents draw the air up from the goggles and out the top of the helmet.
By the way, I do not own a pair of Smith I/O. Sadly, they don't fit my big, Asian head so this is not a biased review. I work for Summit Sports so I know my fair share of the quality and tech of snowboarding gear. Don't get me wrong, EG2s are absolutely great goggles. In fact, they are one of the top goggles out there. Between the I/O and EG2 though, I'd go with the I/O. If you find a pair of EG2 for much cheaper than the I/O, then by all means go with the EG2.
And in case you guys want to know, Oakley makes the best quality lenses out there. They have been doing spherical lenses for ages and they are extremely impact proof. They also address the frame plastic issue with their new Splice series. I/O is still the winner though.
My top 5 goggle list:
Smith I/O (also comes in I/OS for smaller faces)
Oakley Splice (this model was specifically designed for snowboarders by eliminating the plastic around the nose piece)
Vonzipper Feenoms are also popular.
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