Sitting in the cold hunting, There is a considerable difference in temps below zero to temps above in the single digits, You lose a lot of thermal and it doesn't matter how much clothing you have on, When i'm hunting in these cold temps and have to walk to get to where my ground stand is, I only wear one layer walking in to keep down the sweating as much as possible, Thats what brings on the chill much sooner having moisture trapped against your skin, That's the reason why i like wearing Under Armor, It wicks moisture away from your skin into your secondary base layer, I always have a pack i wear, So my jacket and extra clothing is in there and once i get to my spot, I will sit and cool down some then put on another couple layers, I have found this to work and be much more successful to be able to sit for longer periods of time in frigid temps, Obviously, I like to already be tagged out before we get into the last week of hunting so i don't have to endure any of the extreme cold, But that's not always the case...........