Maybe a thermal lens.
It really depends on the player though, if you never break a sweat even when sprinting or under stress then maybe you're OK.
If you're wearing 40+ lbs of gear in the hot sun in sweaty Ontario you may find you need a fan.
I'm in the drier part of B.C. but I use Fogtech and a fan so I can actually see what's going on.
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Airsoft, where nothing is hurt but feelings.
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