What a horrid thought. During one class, I ended up wearing one for half the day. I lost 7 pounds despite drinking water constantly.
What works well in the cool misty Scottish mountains is miserable in other places.
Most of the time, an appropriately colored shemagh or ‘snipers veil’ works perfectly.
I had to wear one quite often when I was AD. Even spent a full month in one on a JTF down around the CA/Mex border. That sucked.
Been going to build another one that is more of a stalking suit, but just have not gotten around to it yet.