Hey Boris! Those old Siroccos are sweet but yes they do sit very high on top of your head. The new ones sit a whole lot lower and (apparently) came very close to meeting ski certifications. Fit between the old and new Sirocco is basically identical meaning if you fit one you'll almost definitely fit the other.
BD Vapor has a very similar harness system to the Sirocco that allows it to wrap evenly and very low on the back of your head so it feels very secure. Similarly shaped shell, too. Fit is very similar to the Sirocco (oval shaped).
La Sportiva RSR is extremely light and definitely a very dedicated skimo race helmet or fast touring helmet. Lower vertical profile than the Sirocco but side protection is about the same.
Mulaz feels a lot like the Vapor, but a touch narrower and a touch shorter (rounder).
The Attivo and Camp Storm are similar to each other and different enough in the fit from the rest of the helmets. The Camp Storm and Attivo helmets are both much rounder (shorter and wider) than most other helmets that I've tried so try your Sirocco on and see where the gaps are between your head and the shell of the helmet. That'll give you a good relative idea of which helmets you'll fit and which ones you won't.
If the helmet is tight on the sides but you have gaps in the front then the Storm/Attivo could work really well. If it's even all around then the Mulaz, Vapor, and RSR will likely do better.
On another note, did you get our email about your order for skin material? If not, reach out to our help email address, we have a question for you!
