Last Saturday I received from a fellow garrison member a set of TK armor that I have been messing with in my spare time. So far have most of the parts rough trimmed and the lid is about 80% finished. Most of the time was spent just making the lenses. You can see it in the bottom photo of the right eye, they have a small 3mm gap at the top edge to vent hot damp air. I stood out side last night for 20 minutes wearing the thing in 40 degree air with no fans in the lid at all and the lenses didn't fog a bit.