Stay cool and comfortable with the Under Armour Women's HeatGear Armour Long Sleeve. This neon base layer top is made with Under Armour's HeatGear fabric, which wicks away sweat and dries quickly to keep you cool and dry during your workouts. The long sleeves and mock neck offer extra coverage and protection from the sun. The fitted design and four-way stretch construction allow for a comfortable and supportive fit. Whether you're hitting the trails or going for a bike ride, this top is a great choice.