The "What is it?" thread - Part III

Pretty sure I know what it is but got nowt ready so won't guess.
 
I was going to leave it until tomorrow before my reveal since I have an idea for another hard one - will shoot it and keep it ready for my next turn!
 
No, I disqualified myself for this round so you're up!
 
Thermal grundies (with silver for added freshness)?
 
Nomex?
 
Sweatband (head or wrist)?
 
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