Ordered this after not being satisfied with cheapo-china brands and having sizing trouble with the N-Ferno 6823 (the 6827 model is fine).  Although the head areas is slightly roomy on me with an average-sized, round head (22-inches) for an adult male, it wasn't troublesome because you can just pull it down slightly from the rear to keep it from going down over your eyes.  And that's part of what's so great; you can get the above-the-eye part all the way down on the eyes if you want, and the below-eye part all the way up to your eyes, so if you choose, you can just have a tiny slit you are looking through.  Once you have it in place, it doesn't shift around under a motorcycle helmet, so that's a plus.  Breathing mesh is good/easy, well-placed.  The entire layout is accurate anatomically, from chin to mouth, to nose, to under-eye length to hinge angle which allows double-covering of ears.  Perfect score for me.  Warmth is upper-medium.