But do they actually work?
If it works then it may not be so goofy.
Exactly.
As a (poor) analogy - when I was in high school and played football, the end of our season was always bitterly cold. As a lineman who didn't need to touch the ball, I would always layer up with wool socks, long johns, hat underneath helmet, etc. Didn't affect mobility, but initially had guys laughing at me. I say initially, because after 5 minutes of being outside my teammates didn't think I looked so goofy any more.