Under Armour forged their immense reputation on the design and quality of their base layers, so you know that every piece in our Under Armour base layers collection will take your training clothing to the next level. Built with the latest sportswear tech like sweat-wicking fabrics and Under Armour HeatGear, this collection will keep you feeling cool and dry during the summer, while providing extra warmth for your winter training regime. Find Under Armour base layer tops, tights, leggings, shorts and vests for men, women and kids in this extensive collection. For the full collection, shop Under Armour for men, women and kids.