- UPF 30 - Knit back and back sleeve - wearer’s left chest has a zipper pocket - hidden snap buttons at the chest pockets - adjustable sleeves with button at the middle The product is a men's long sleeve button-down shirt by Under Armour in a light gray color, size L. It is made of polyester material from the Under Armour HeatGear product line, designed for comfortable and breathable wear. The shirt features a button-down collar style and a button closure, suitable for a casual and stylish look. Perfect for everyday wear or outdoor activities, this shirt combines functionality with the quality and style that Under Armour is known for.