I bought this to replace my Castelli skull cap, which was too small and didn't cover my ears well. This was my first ProCorsa purchase and I'm very pleased. Fit is snug but not overly tight, it covers my ears completely and the wind panels offer exceptional protection from the wind and provide additional warmth. It's a lot warmer than the Castelli. Great purchase.
Late fall-winter riding is a battle for balance between too hot (sweating, then getting cold) and too cold. For me this caps just right for 35-45F. Havent ridden with this cap into the 20s yet, but I might opt for thermal cap for those temps.