I felt the designation "Fleeced Extreme Cold" is misleading.  These are no heavier weight than regular Thermal underwear, and, although the inner face is softer than the outer, I would not say it is "Fleeced", simply woven of a synthetic material in the same way the outer face is woven.  I certainly won't be using them in extreme conditions...after trying them on a marginally cold day I found them no warmer than regular less expensive thermal underwear.