Stay warm and dry with Under Armour Kids HeatGear Long Sleeve Mock Base Layer Shirt, featuring breathable fabric, moisture‑wicking technology, lightweight insulation, and a snug fit for active play. Ideal for layering, it offers quick‑dry performance and a relaxed fit that moves with your child’s energy. Its soft interior keeps skin comfortable while the durable construction withstands everyday adventures. Available in classic white or bold black, this base layer is a versatile essential for any