The Under Armour Women's HeatGear Armour Long Sleeve is a popular choice among trail runners. It is made with lightweight and breathable fabric that wicks away sweat to keep you dry and comfortable during your runs. The long sleeve design provides extra coverage and protection from the elements. It also features a compression fit that supports your muscles and reduces fatigue. With its stylish design and performance features, this bodysuit top is a top pick for women's trail running.