I just got back from walking around outside. 1.75 miles, 29 minutes, wind chill -10. Skin temperature started at 80 degrees and dropped to 60.8 degrees. My toes were starting to get numb but the rest of my body was fine. My core was probably too warm as I was a bit overdressed. I want to go out at -20 and -30 just to see what it feels like. I'll have to use a flashlight as it will be dark when it gets to -30.