I normally stay away from well known brand named products. People fighting, dying, flaunting and praising logo clothing does not work for me. When I started working in sub zero conditions, I had acquired base layer garments that were adequate but poorly constructed. My second season out I got some of these 4.0 base layers and really found the difference to be worth the expense.
They fit more comfortably and certainly do the job of keeping me warm and safe. They are really an essential component to enabling me to function at the needed level my team needs of me.