It works in very cold temps with another layer or two. I never wear the hoodie on my head when riding because of helmet (not law here in UT, just me), but the hood around the neck helps keep cold air from around the sides and back. Sometimes I wear hoodies to work because my work attire is t-shirt and jeans in the summer, and sweat shirts (sometimes hoodie) and jeans in the winter. I just zip the removable hoodie out of the jacket and flop the hood that I'm wearing out the back. I haven't been been strangled... yet.