"1. Scarf. Maybe this is obvious to you but it wasn't to me. I considered it a luxury item not worth of space in my kit. I quickly discovered my error as I tried to move around in gusty, 11*F winds with my parka partially open to avoid overheating."

Yes, I'm always amazed at how much warmer I feel when my neck/chin are protected from the cold.

I've taken to wearing a neck gaiter (merino wool) instead of a scarf - more effective IME and less bulky. Being a Buff fan I tried theirs first, but found it thin and itchy. I much prefer the Icebreaker version.

[No affiliation with either outfit ... ]