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The foam is covering vents that are too small for bbs to pass through, and are positioned on the perimeter of the goggles. Removing the foam allows better air circulation. I have a pair of the turbofan, wore them all day sunday and they worked well, but i had to have them on full blast. Mine might be a cheap knockoff lol :P I'm replacing them anyway because I accidentally damaged the foam that cushions it against your face lmao don't rip THAT foam. :P
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