if you look at bolle X-800, there is a space between the frame and the lense, but not the frame and the face. This allows for airflow all around the lense, it's amazing (compared to other goggles) at reducing fogging, but it still fogs at certain times...
I guess that's considered non-sealed as paintball paint could enter the goggle around the lense. I love my X-800, but only for airsoft.
And yes, Ibby is right...ESS Turbofans are my dream goggle...
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