This is an excellent men's Nike Golf Dri-Fit UV Fine Line golf polo size xl.
"While the fine line integrated into the fabric gives this sport shirt a distinctive look, the Dri-FIT UV fabric truly sets it apart. Comfortable and breathable, this high-performance sport shirt is a handsome addition to any wardrobe. Design features a self-fabric collar and three-button placket. The contrast Swoosh design trademark is embroidered on the left sleeve. Made of 5.5-ounce, 88/12 polyester/spandex that provides UPF 30 protection. Pearlized buttons are selected to complement the shirt color."
The color is slate blue. I took a close-up so you can see the fine line detail. The 12% spandex give this polo a nice, comfortable stretch. Great for golf, and perfect for every day.
Chest: 51" Length: 33"