This is a Mynock's Den “Operator”-style helmet, cast in Smooth-On's Smooth Cast 65D and ONYX resins (non–cold cast). It measures 8.75" from ear to ear, and 9.75" front to back (inner dimensions). The lower cheek section and rear neckline guard are made of flexible rubber. The T-visor has a dark grey-blue tint. Inside, the helmet is fully lined and padded, with removable padding secured by Velcro for easy adjustment.
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The side antenna is made of metal and attaches magnetically. It will detach if bumped, but won’t fall off or get lost — it’s tethered to the helmet with a coiled cord.
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For the paint job, I started with a hammered texture spray base, then airbrushed the main colors using Tamiya acrylics. Weathering was done with a mix of materials, including Army Painter washes, Vallejo pigments, real rust, and rubbing alcohol.
 
Check out the dedicated helmet page, where you can read the helmet's in-universe backstory here.
 
NOTE: this helmet is intended for cosplay or display purposes only. It has no safety rating, and is not designed for impact sports like airsoft, paintball, or to be used as personal protection of any kind.