REASONS TO BUY
Secure magnetic lens changes
Excellent optics
Pairs well with many faces and helmets
Comfy
REASONS TO AVOID
Expensive
Doesn't include a hard case
Smith I/O Mag Review
This modern classic fits many faces, doesn't fog up, and is a master of clarity
The extra-crisp and clear Smith I/O Mag deliver outstanding optical quality while skiing in tough conditions.
Credit: Chris Maxcer
By Chris Maxcer ⋅ Review Editor ⋅ March 19, 2026
RELATED: The Best Ski Goggles of 2026
Our Verdict
The Smith I/O Mag is a classic spherical goggle with remarkably crisp and clear near frameless lenses. Its ChromaPop technology improves color and contrast, making these goggles a winner with hard-charging skiers as well as everyone who appreciates stunning winter vistas. The medium fit and flexible frame fit many face sizes and shapes well. The magnetic lens changing system is fast and easy, but you need to know where to press to release a lens, or you'll fight the goggles before you figure it out. The ventilation and anti-fog coatings work well. Our only quibble is the relatively high price point, but we don't know anyone who's complained about the view or the comfort once they had them on.
Our Analysis and Test Results
Yeah, when the fog rolled in, we knew it was time to change to the included low-light Smith I/O Mag lens! Credit: Ethan Maxcer
Likes
We love the outstanding quality of the Smith I/O Mag ChromaPop lenses. They're remarkably crisp and clear and deliver excellent color fidelity. The dark primary lens cuts glare in full sunshine on a bluebird day, and the lighter lens reveals subtle detail in flat light, letting us cruise down fogging runs with confidence.
With a near frameless design, the sleek lenses provide a very good field of view. The spherical shape results in full coverage with no easily noticeable distortion.
The Smith I/O Mag lenses provide crisp optics that reveal snowy details in both bright and low light. Credit: Chris Maxcer
We also really like the 3-layer DriWix face foam. It wicks moisture on fast-lap ski days, and it's connected to a flexible frame that fits our faces well, making these very comfortable to wear for hours at a time.
The Smith foam is soft, and the flexible frame contours faces for improved all-day comfort. Credit: Chris Maxcer
The Smith I/O Mag has consistently impressed multiple testers over multiple seasons with its fog-free performance. Dual-lens construction with large vents and an anti-fog coating reduces the effects of fogging to near zero.
The I/O Mag places a thin section of foam over a large vent at the top to help let warm, moist air escape. Credit: Chris Maxcer
Changing lenses is fast and easy, but you need to know where to find an interior tab to release the lens. We've known some friends and colleagues to ignore instructions — we're not naming any names here — then fight with goggles to free the lenses.
It doesn't help that the tab blends into the interior of the goggle, making it easy to miss. Still, once you know it's there, we could swap lenses in less than 20 seconds.
The Smith I/O Mag has a nearly hidden tab you must push to release the lens when trying to swap them out. Credit: Chris Maxcer
Dislikes
While there is a lot to like about the Smith I/O Mag, our biggest issue is with its relatively high price point. If it came with a hardshell travel case, it would soften the blow a bit.
When we spend this much on a ski goggle, we must admit that we're a bit disappointed by the cheap stuff sack. Credit: Chris Maxcer
With a previous pair, our lead tester accidentally ruined the interior anti-fog coating by attempting to wipe out melted snow after a lunch break. Anti-fog coatings can be smeared when wet, and we don't think goggle manufacturers, including Smith, make enough effort to warn consumers about proper interior lens care. Basically, you can air dry goggles or lightly dab moisture away from interior lenses. Never wipe the interiors when they're wet!
In difficult lighting situations, the quality of the Smith lenses makes it easier to navigate down hard-to-read slopes. Credit: Chris Maxcer
Should You Buy the Smith I/O Mag?
The I/O Mag is one of the more expensive models we tested, but the optical quality is stellar, and the included low-light lens provides next-level illumination on darker days. Overall build quality is excellent, durability is impressive, and the fit for medium faces is comfortable for long hours. The near frameless spherical lens shape pairs well with many helmets and looks stylish without seeming oversized.
What Other Ski Goggles Should You Consider?
If you're going to spend hundreds on a goggle, we think spending a bit more to get into the Smith 4D Mag is a reasonable idea. They offer a superior vertical field of view and an even more comfortable fit. The Giro Contour has similar optical performance but goes all in on a fully frameless look. If you'd like a versatile option at less than half the price, consider the photochromic Julbo Launcher. Its lenses automatically change their tint as it gets lighter or darker while you ski.
Side-by-Side Comparison
Compare Smith I/O Mag versus top competing products:
| Awards | |
|---|---|
| Price | $283 List Check Price at Backcountry |
Overall Score  |
|
| Star Rating | |
| Bottom Line | This modern classic fits many faces, doesn't fog up, and is a master of clarity |
| Pros | Secure magnetic lens changes, excellent optics, pairs well with many faces and helmets, comfy |
| Cons | Expensive, doesn't include a hard case |
| Rating Categories | Smith I/O Mag |
| Lens Quality (20%) | |
| Comfort (20%) | |
| Ventilation and Breathability (20%) | |
| Ease of Changing Lenses (15%) | |
| Durability (15%) | |
| Style (10%) | |
| Specifications | Smith I/O Mag |
| Number of Included Lenses | 2 |
| Tested Lens | ChromaPop Sun Green Mirror, Chromapop Storm Rose Flash |
| Lens Shape | Spherical |
| Frame Size | Medium |
| Layers of Foam | Triple layer |
| Ventilation | Anti-fog treated |
—Chris Maxcer
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