After purchasing the Halo 3 Legendary Edition and thinking the replica of Master Chief's helmet would be large enough to fit over my head, you can imagine how disappointed I was when I realized it would only house a copy of the game. NECA has probably taken stock of how many dreams were crushed after making this move, and decided to create a fully-functional motorcycle helmet that you can actually use.
NECA released a prototype model of the Mjolnir Mark-IV helmet for the public to see, but we'll have to wait a while before we see it in color. For now, you can drool over this concept model and think about those bike-riding friends in your life who need a little extra protection. If they're Halo fans, they'll probably thank you. Or think you want to make them look totally uncool. Whichever.