Men's ColdGear UA Base 1.0 Leggings Bottoms by Under Armour XL Under Armour's lightest weight, relaxed fit UA BASE legging. Ideal for higher temperatures and exertion levels. Lightweight ColdGear thermal grid fabric is engineered with interlocking channels to trap heat for core temperature and rapid drying in a super light-weight design. Featuring ergonomically placed seams enhanced by flat lock stitching for superior comfort that won't restrict movement. ArmourBlock technology stops odor causing microbes for maximum scent suppression.