UA Cold Gear
Thermax
Merino Wool
Outer layer with a Wind Barrier
I use the folowing depending on exactly what the temp is. I hunted 24 below zero in NE. in a blind in Dec, and around5 below zero in a Treestandwith No problems, but I am pretty warm natured.
The Merino Wool and the Wind Barrier have been my best 2 weapons against the cold. UA is pretty good as well.
Dan