Fit:
I would say this helmet fit like the Arai Quantum-f if your head fit that. Among the Arai helmets, if I recall correctly from when I used to work at Cycle Gear, Quantum-f was best for the wider heads versus narrower fit of the other Arai models. I also have a Scorpion EXO 700, which actually fit a little better for me because it's even wider than the 400 I think (the difference though I think is minuscule). Unfortunately for my specific head shape, I cannot wear the 400 for anything more than 1 consecutive hour (hence why I got the 700).
400 in Medium: Fits very snug. But for my head, felt uncomfortable right in the upper sides where there were no padding (= 1hr maximum wear time for me).
400 in Large: Fits very snug. But I could still feel the pressure points as with the Medium.
700 in Medium: Fits snug, but still can feel the pressure points.
700 in Large: Fits slightly loose in cheeks, but the pressure point is gone, hence I can wear it beyond an hour's time. (yes I has a big head unfortunately)
Overall I think Scorpions have really nice padding. Yes, they fit REALLY snug and tight, but after the accident I got into earlier this week, I'm happy for it! (Crash opinion below.) Initially it's so tight fitting, I have trouble closing my jaw without trying to puff out my cheeks first. I would have no idea at this moment how well the fit would change after further wear. Will have to have one in good condition and worn more frequently. Apparently this padding/fit is common for the Scorpions which is good. I just kind of wish they sold extra padding for more customizable fit.
On the Road:
The last I wore this and was able to go on freeway with was earlier this week. We rode on a fairly windy night though, but the ventilation seemed pretty decent. I don't remember hearing too much of the wind even w/ most of my vents closed. O.o Later on I needed air cuz the wind went away, but the vents were good. No fogging, even during my past day rides.
"Crash" test:
So, earlier this week I managed to experience for my first time, first hand what it's like to crash and slide elegantly along the pavement (see thread here ). My head felt so comfortable against the padding inside the encasement considering what was just inches away. The only indicator for me that I was sliding on pavement was the sound of the scrape on my left cheek on the helmet itself. I don't know if this is normal for any helmet, but shoot, that's exactly what it felt like to me. If there was an impact, I didn't feel it.
Anyways, that's all I can say right now about it.
