This is a 3d model, 1:1 ratio, wearable replica helmet concept of the Red X helmet (Batman Arkham Knight style). I modeled this helmet after a piece of concept art.
You can purchase this file on my Etsy account.
https://www.etsy.com/listing/900673721/red-x-teen-titans-batman-arkham-knight?ref=shop_home_active_2