havent used mine yet, but got the 2010 air raid i believe they are the same or very similar to otts [the dumont ones]
theres 4 vents, 2 on the inside thigh where they usually are [by crotch down to knees or so] then 2 on the opposite side, they seem warm and the worst would happen would be to layer something under if youd need to but thats about it and i ride in ny where it goes around 5degrees to 30 degrees usually in that range