Under Armour is a brand led by innovation and performance. The whole thing began with a single tee-shirt, the Shorty. The idea was to make a better tee. You may wonder, what is a better tee? It was supposed to be comfortable and to optimise moisture wicking. Keep you dryer and therefore, comfier. Since then, UA engineers never ceased improving their products with one goal in mind. Help the best athletes become even better. Check out our selection of Under Armour thermal underwear and improve your performance next season!