It fits good, and seems to have adequate ventilation, but it's still only in the 70-80's here in PA. The foam padding is cut so the bionic neck brace fits right in it. Also it does what it's designed to do stop roost. But of course it won't stop boulders, nothing will.
At 210 lbs, this may not work out too well. I think that it may run too tight for your build. MSR has a "Covert" that may work out better for you, if you check out the sizing chart it will give you a little more insight.