The Under Armour Women's ColdGear Authentic Base Leggings are a top-selling choice for women's spandex base layer bottoms on Amazon. These leggings are made with a dual-layer fabric that provides a warm and comfortable fit. The material is also moisture-wicking, keeping you dry during intense workouts or outdoor activities. With a four-way stretch construction, these leggings offer excellent mobility and flexibility. They have a wide waistband for a secure and flattering fit. These base layer leggings are perfect for layering under your favorite pants or wearing on their own for workouts or outdoor adventures.