Under Armour Leggings are made of compression fabric for an ultra tight, second skin locked in feel. Flat seams give a smooth fit. Heatgear fabric is ultra smooth for a lightweight feel. Wicking technology helps evaporate moisture, has four way stretch and incorporates anti-odor technology. Polyester Elastine fabric is washable at home. Perfect for a day at the gym or just to be comfortable while running errands!