Under Armour makes Base Layers and Underwear too! How awesome is that. UA will well known for their shirts, pants, and boots but THEY ALSO make outstandingly comy underwear and base layers. Police and military people LOVE them and give them very very high ratings.
Some of the most popular items are the Play Up Tech pants, Freedom tech Shorts, Raid 2.0 shorts, Tec V neck shirt, Tac crew base shirt, and the Heat Gear underwear.