>>512419926
A cheap $2 emergency blanket is not going to work. A $500 purpose built thermal insulation device will work long enough to get you out of trouble. There is a difference.
>cloaks heat up after 10 minutes of wear
Which is only noticeable at a close distance. They’re also designed as a way to escape danger. And primarily, you use them to cover your tents. You don’t put them directly on your body unless you’re escaping.