
These are regular goggles. They're not completely airtight (especially if you wear glasses underneath), but they protect your eyes from the simplest of things. But it won't work. for smoke or anything that requires a tight fit. I can easily slide my finger through the side panel when wearing glasses, but not as easily when I take my glasses off. For sizing reference, I've included a screenshot of the specs for the glasses I'm wearing. I have a small head and these glasses fit just fine. Although the strap is adjustable, it doesn't sag a lot. I had to loosen it as much as possible so it wasn't so tight. But if my head was a little bigger, it would be too tight and wouldn't fit.

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