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sharkninjakiller1997 posted on r/cosplayhelp1w
Tactical/under-helmet balaclavas are what you want — moisture-wicking poly fabric, made to sit comfortably under a helmet/hood without cooking you. For solid black (not camo), check out the Naroo F3F — thin, breathable, moisture-wicking, and low-bulk so it won't add weird shape under your hood. Naroo F3F Balaclava in Black