Under Armour Base 4.0 Leggings. Reliable warmth for the most extreme conditions! Your first -- and best -- layer of defense against extreme cold! Under Armour Base 4.0 Leggings are Under Armour's thickest, warmest base layer, making them ideal for cold weather hunting, sports and chores. Equipped with ArmourBlock anti-odor technology to help prevent and eliminate tell-tale odors. Build a better base: Body is made of 7.25-oz. 96/4 polyester / elastane; Knee to hem is made of 4.5-oz. 93/7 polyester / elastane; Fitted style is designed to fit close to your body without the constriction of compression; Ergonmic seam placement and flatlock stitching won't chafe or irritate; ArmourBlock neutralizes odor-casuing microbes to keep your gear smelling fresher, longer; Imported. State Size. Under Armour Base 4.0 Leggings, Black