ColdPruf Technical Fiber performance polyester, merino wool blend for comfort, warmth, dryness & odor control. 2 layer engineering traps air between layers providing a natural barrier of warmth. Tagless feature, flat seams, comfort waistband, front & back rise on pant. 100% CPT performance polyester on the inside, 70% polyester/30% merino wool on the outside. For medium to high activity, very cold to extreme cold temperatures.