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There was a post in the thread that mentioned a pair of climbing pants with zippered vents on the back. The more I think about it, that might be what I need to let me use a pair of chainsaw protected pants in the LA summer. I'm imagining a zipper that would run up the side of the leg. When you were climbing, it'd be closed of course, but while you're having a sip of water, or when you are waiting for a saw to be filled, or while on the ground you could open up that zipper and ventilate.
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All of my climbing pants have this sort of ventilation, and it works wonders in the summer time. A little shot of fresh air and, "Wooo!" I'm ready to go again. My zippers are all in the front though.